Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A unitary planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line when in place but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line.

Abstract: The present invention provides a weep plug for an oil sump having a central vent passage and one or more weep passages parallel to the central passage. The weep passages allow oil to flow back into the sump where it may be recovered.

Abstract: A closure includes an object to be closed. The object having an opening hole, a plug member to be inserted into the opening hole, and a seal member disposed on the plug member. The seal member is formed of a ring-shaped elastic member and contacts the object to be closed and the plug member to close the object. An insertion portion of the plug member is smaller than theopening hole. An insertion portion of the plug member is provided with a seal member-receiving groove and is smaller than the opening hole. The seal member-receiving groove is provided with a seal member-seating portion, which has an outer surface with a predetermined diameter smaller than that of the opening hole and larger than that of a bottom of the seal member-receiving groove. The seal member has a cross-sectional shape, which can be fitted into the seal member-receiving groove of the plug member. The seal member has an outer diameter larger than the opening hole in a mounting state into the seal member-receiving groove.

Abstract: A seal clamp assembly for sealing an opening in a piping system includes, in an exemplary embodiment, a base having a first side, a second side and an aperture extending therethrough from the first side to the second side, and a brace coupled to the base. The brace includes a distal pad hingedly coupled to a distal end portion of the brace. The seal clamp assembly also includes a spring bridge coupled to the base first side. The bridge includes a substantially rectangular U-shaped frame and an aperture extending through the spring bridge frame such that the spring bridge aperture is in substantial lineal alignment with the base aperture. A clamping assembly is coupled to a proximate end portion of the brace.

Abstract: A sealing terminal for an installations duct of tubular shape is provided. The sealing terminal includes a plug having a threaded frustoconical part which can be screwed into one end of the duct, a manipulating head with a peripheral shoulder in a continuation of the plug, where the peripheral shoulder is designed to face an edge face of a border around an opening of the duct, and an annular seal arranged against the peripheral shoulder.

Abstract: A self-locking, high-pressure stopper is disclosed. Also disclosed is a method of using the stopper. The stopper allows a branch pipe to be plugged from above ground using an elongated insertion tool. The self-locking stopper of the present invention includes a body having O-ring seals that is inserted into the branch pipe that is to be plugged. The self-locking stopper has outwardly biased locking tabs that are provided to engage a shoulder or step in the branching pipe in order to prevent the stopper from being pulled out, or pushed out by fluid pressure, once it is in place. The stopper system also includes a flanged insertion pipe used for inserting the stopper into the branch pipe. The stopper also has an adapter for engagement by an insertion tool that allows a user to insert the stopper from above ground.

Abstract: A test plug and method for isolating and testing a connection, such as a welded connection, which interconnects a wall of tank, vessel, or pipe to a branch pipe or nozzle. The test plug isolates the connection from the remainder of the tank, vessel or piping system and enables pressure/leak testing of the connection without requiring pressurization of the entire tank or vessel or a large section of the piping system. Further, the test plug can be utilized during welding operations to isolate harmful materials, vapors or fumes existing within tanks, vessels or piping systems from the weld location and to permit the flow of an inert gas to safely flush any potentially harmful vapors or the like away from the welding area.

Abstract: A leak testing device includes a generally cylindrical sealing gasket which defines a recess therein. The gasket includes first and second end portions for receiving the respective ends of two adjacent conduits. A shoulder portion extends from the gasket. A diaphragm member is positioned in the gasket. A hole is provided in the diaphragm member which can be selectively opened or closed by a valve operably connected to the diaphragm member to thereby permit or restrict the flow of a fluid between the two conduits. A coupling for clamping the leak testing device about one or two conduits includes a generally cylindrical member having a central axis and including a plurality of sections. The sections are interconnected to one another by at least two hinge members in a manner that two sections have free end points to be releasably fastened together.

Abstract: A test cap (10) for use with a building drain (102) to allow hydrostatic testing of the building drain. The test cap includes an end wall (12) with a sidewall (14) extending around the perimeter of the end wall. The top side (12A) of the end wall is provided with an annular groove (16) which surrounds a center portion (18) of the test cap. The diameter of the groove is such that a standard sized pipe (104) can be used to apply force to the groove to detach the center portion from the end wall of the test cap. Once hydrostatic testing is complete, the center portion is detached from the end wall of the test cap and removed to allow access to the building drain.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line. Removal of the barrier is facilitated through the use of a piercing device and pull tab which can be actuated from a position outside of the waste line.

Abstract: A retention system for holding and mounting a cover cap to a plumbing fitting having a tubular terminal that projects at an opening through a bath or shower wall, comprising a retainer ring fitting on said tubular terminal and tightenable toward said wall, a series of retention cams on said ring and space about a longitudinal axis defined by the ring, there being gaps between successive cams, and there being retention shoulders on the cams, the retention shoulders facing in directions toward said wall, for retaining holders on the cover cap, after said holders have been passed longitudinally through said gaps and after the cap has then rotated to cause said holders to slidably engage the cams and became wedged against said retention shoulders.

Abstract: A test plug and method for isolating and testing a connection, such as a welded connection, which interconnects a wall of tank, vessel, or pipe to a branch pipe or nozzle. The test plug isolates the connection from the remainder of the tank, vessel or piping system and enables pressure/leak testing of the connection without requiring pressurization of the entire tank or vessel or a large section of the piping system. Further, the test plug can be utilized during welding operations to isolate harmful materials, vapors or fumes existing within tanks, vessels or piping systems from the weld location and to permit the flow of an inert gas to safely flush any potentially harmful vapors or the like away from the welding area.

Abstract: An adjustable bottle stopper that stoppers a bottle by expanding a cylindrical elastic spacer within the neck of the bottle. According to the invention, the bottle comprises of: a threaded disk nut, a bolt that is screwed into said threaded disk nut, a lower pressure stamp nut in which the above assembly is screwed into, a cylindrical elastic spacer that is mounted on said bolt after performing the above steps, an upper pressure stamp that is mounted on the bolt after the mounting of the cylindrical elastic spacer, a handle nut which is screwed and locked on said bolt after said upper pressure stamp is mounted.

Abstract: A cover plate has an inner surface shaped to contact a closet flange and an opposing outer surface. The cover plate is adapted for covering a drain pipe end having a closet flange that extends perpendicular to the drain pipe end. The inner and outer surfaces terminate in an outer cover perimeter having approximately the same diameter as an outer flange perimeter of the closet flange. The outer cover perimeter has a protective sidewall that extends upwardly, normal to the outer surface, for protecting the closet flange and facilitating the installation of floor tile adjacent the closet flange. The cover plate includes cover apertures positioned to coincide with flange apertures of the closet flange. The cover plate further includes cover locking bolts and cover locking nuts adapted to be positioned through the flange apertures and the cover apertures for removably fastening the cover plate to the closet flange.

Abstract: There is described a method and an apparatus for testing or isolating a section of pipe, the apparatus comprising a cylindrical mandrel for insertion into a section of pipe, the mandrel including at least one portion of progressively increasing diameter, and at least one seal disposed around the mandrel and actuatable in response to applied fluid pressure to move along the increasing diameter portion of the mandrel, causing the seal member to radially expand into sealing contact with an inner surface of the pipe.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A unitary planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line when in place but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line.

Abstract: A plumbing test fitting for insertion in a plumbing drain or pressure fluid distribution system includes a body with two spaced-apart lateral ports formed thereon and opening into a central bore of the body. One of the ports is adapted for receiving a hose bib for connection to a source of test fluid and the other port is provided for withdrawing a flexible diaphragm from the interior of the body with a pull member extending through the other port. The flexible diaphragm is retained in the body during a pressure or leakage test of the plumbing system and is removed after completion of the test by tearing the diaphragm away from a supporting rim part. The flexible diaphragm is foldable to be withdrawn through the other port which may be of a diameter smaller than the normal unfolded diameter of the flexible diaphragm.

Abstract: A pipe testing apparatus comprising an elongate tester body having sealing means and actuator means to deform said sealing means on activation. The apparatus is further provided with means to bias actuator means axially away from the sealing means on deactivation of said actuator means. The apparatus is typically used to test the integrity of pipelines at specific points, for example joints or welds.

Abstract: A plumbing test fitting for insertion in a plumbing drain or pressure fluid distribution system includes a body with two spaced-apart lateral ports formed thereon and opening into a central bore of the body. One of the ports is adapted for receiving a hose bib for connection to a source of test fluid and the other port is provided for withdrawing a flexible diaphragm from the interior of the body with a pull member extending through the other port. The flexible diaphragm is retained in the body during a pressure or leakage test of the plumbing system and is removed after completion of the test by tearing the diaphragm away from a supporting rim part. The flexible diaphragm is foldable to be withdrawn through the other port which may be of a diameter smaller than the normal unfolded diameter of the flexible diaphragm.

Abstract: A method of sealing a pipe and a device for sealing the pipe which prevents gas leakage out of a pipe stub plugged by a stopper disposed in a tee fitting, to allow a permanent cap to be welded onto the pipe. The device comprises an expandable plug comprising a pair of plates with a sealing member disposed between the plates. The plates can be squeezed together, for example by tightening nuts onto bolts extending through the plates to compress the sealing member and cause the periphery of the sealing member to expand against the inner wall of the pipe. Stabilizing means, for example a nut having a reverse thread and a complimentary tool, is provided for stabilizing the expandable plug radially within the pipe as the plates are squeezed together. The expandable plug is inserted into the pipe stub after the bypassed section of pipe has been removed, and lodged in the pipe by squeezing the plates together to expand the sealing member against the inner wall of the pipe stub.

Abstract: A method and apparatus for testing plumbing installations including a tool for making an opening through a test cap or other blockage in a fluid-carrying line of a plumbing system. The tool and cap make the testing method possible. During the rough-in plumbing phase of construction, a test cap welded in the drain pipe seals the drain line from the sewer line at the location of the clean-out. Thereafter, the rough-in plumbing system is tested by pressurizing the system through the clean-out on the building side of the cap. Following successful completion of this test, the top-out plumbing is completed, leaving the test cap welded in place. After the roof vents are in, the top-out test of the plumbing system is made, also through the clean-out. After final test and inspection, a special tool constructed in accordance with the present invention is inserted down the clean-out to penetrate and ream-out the test cap.

Abstract: Plug means (10, 18) for lockable sealing of a passage opening with a support surface (19) intended for positioning the plug means. Simple lockability and demountability are brought about by virtue of the plug means comprising a sealing plug (15) for interaction with the sides of the passage opening, a retaining means (129), connected to the sealing plug, for interaction with a hook means (20) connected to the passage, and a flexible resilient connecting element (149) between the sealing plug and the retaining means.

Abstract: A plug for a pipeline fitting is provided and includes a cylindrical body having an annular sealing groove, an O-ring fitted in the annular sealing groove, an expanding plate having an outer edge inserted into an annular locking groove of the pipeline fitting, and an expanding device connected to a plugging machine to insert the expanding plate into the locking groove of the fitting. The expanding plate is divided into two half plates and has a central opening with a minor axis in the direction of expansion and a major axis perpendicular to the expansion direction. The expanding plate has elongated holes and pins formed at positions symmetrical with respect to the dividing line of the expanding plate. The cylindrical body has threaded holes formed at positions corresponding to the elongated holes of the expanding plate. Screws are screwed into the threaded holes through the elongated holes to couple the expanding plate to the cylindrical body. The cylindrical body has a central circular recess.

Abstract: The present invention is directed towards a dust plug for insertion into a fluid conduit system. The dust plug is comprised of an insertion end, removal means, and a hollow central body located between the insertion end and the removal means. The insertion end of the plug is formed as a solid flat end so that when the plug is inserted into the fluid conduit system, the hollow interior of the plug does not communicate with the interior of the system. Additionally, the removal means is preferably formed as a continuous lip about the end of the hollow central body.

Abstract: In combination with a sewer and drain pipe plug testing device including an expandable plug having a flexible strap-like member secured at a one end of the expandable plug which enables removal of the expandable plug from a sewer or drain pipe after testing is complete. The improvement comprises a handle-like member secured to the opposite end of the strap-like member. The handle-like member would have a predetermined size which is at least large enough to prevent entry into the open sewer and drain pipe. There is at least one aperture formed through the handle-like member that has a predetermined shape substantially identical to a nut-like portion of a plug member disposed in the sewer and drain pipe to enable tightening and loosening the plug member into and from, respectively, the sewer and drain pipe. Also, there is at least one round threaded aperture drilled into the handle-like member that intersects the aperture formed into the handle-like member for engaging the nut of a threaded closure plug.

Abstract: A tube testing system consists of two subassemblies, the probe and the applicator. The probe uses a stack of Belleville style washers that when compressed allow the locking fingers to relax and the probe to be inserted into the tube. Once the probe is placed in the correct location using the applicator, the Belleville style washers are allowed to expand, locking in the fingers and engaging the urethane seals. As the water fills the tube, the air is pushed through a bleed hole in the mandrel of the probe. The bleed hole leads to a chamber in the top of the probe that contains a plastic ball. The ball floats on water and as the chamber fills, the ball seals off the leak path and the tube can then be pressurized and the test performed. Once the test is complete, the water is drained and using the applicator, the probe is removed from the tube.

Abstract: A pipe end fitting (13) has a cup-shaped body (15) for fitting on the end of a pipe (14), and gripping (20, 22) and sealing (18) assemblies that fit radially inside the pipe and the cup-shaped body and are radially expandable to engage the pipe interior. The gripping assembly Includes a toothed expandable assembly (20) and an expansion mandrel (22) that is urgeable axially into the cup to expand the expandable assembly. This also axially compresses the sealing assembly (18), which is formed of at least two annular bodies (30, 34) and two sealing rings (42, 56). At least one body has a ramp surface (74, 76) that urges radial expansion of a sealing ring (42, 54) to seal to the pipe.

Abstract: In combination with a sewer and drain pipe plug testing device including an expandable plug having a flexible strap-like member secured at a one end of the expandable plug which enables removal of the expandable plug from a sewer or drain pipe after testing is complete. The improvement comprises a handle-like member secured to the opposite end of the strap-like member. The handle-like member would have a predetermined size which is at least large enough to prevent entry into the open sewer and drain pipe. There is at least one aperture formed through the handle-like member that has a predetermined shape substantially identical to a nut-like portion of a plug member disposed in the sewer and drain pipe to enable tightening and loosening the plug member into and from, respectively, the sewer and drain pipe. Also, there is at least one round threaded aperture drilled into the handle-like member that intersects the aperture formed into the handle-like member for engaging the nut of a threaded closure plug.

Abstract: A method and an apparatus for cleaning a heater bellow in a chemical vapor deposition chamber by utilizing a plug and a plug base specifically designed for such cleaning are disclosed. The apparatus consists of the plug and the plug base which can be advantageously mounted in a heater bellow for the filling of the bellow with an oxidizing fluid such as H2O2. After a suitable soaking period of the oxidizing fluid, the fluid is drained away and then deionized water is used to fill the bellow to rinse the bellow wall and to remove the oxidized compound of metal, such as WO3. During the soaking process by H2O2 or by deionized water, an inert gas such as argon may be purged through the fluid to improve its uniformity and to improve its interaction with the metal oxide deposition on the bellow wall.

Abstract: There is described a method and an apparatus for testing or isolating a section of pipe, the apparatus comprising a cylindrical mandrel for insertion into a section of pipe, the mandrel including at least one portion of progressively increasing diameter, and at least one seal disposed around the mandrel and actuatable in response to applied fluid pressure to move along the increasing diameter portion of the mandrel, causing the seal member to radially expand into sealing contact with an inner surface of the pipe.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A unitary planar disk is molded with the cylindrical section and is of a circular circumference which completely blocks the water line when in place but which is selectively removable from the cylindrical section thus removing the barrier to the passage of water through the line.

Abstract: A seal adaptor assembly for use in a stroking universal joint of the type having an outer drive housing member having an exterior wall of non-uniform dimension including spaces between the parts of the housing enclosing the drive channels. The seal adaptor assembly includes an annular body and a plurality of insert having greater rigidity than the material of the annular body and wherein the inserts are located in the annular body at sections thereof that are located within outer housing spaces between the drive channels. The inserts are supported within the annular body at thin wall sections thereof and thereby provide for a more uniform compression of a resilient seal member between the housing and a clamp for holding the resilient seal member in place on the housing.

Abstract: A conduit plug has a securing element, a retainer, an enclosing element, an elastomer, a pusher and trapezoidal stops. The retainer has an outer threading corresponding to the inner threading of the securing element and extensions each extension having a wedged end formed on a free end of the extension. Each extension extends through a corresponding one of the holes in the enclosing element, through holes in the elastomer, bores in the pusher and slits in the stops so as to securely engage with a face of the trapezoidal stop. The mating of the inner and outer threading is able to deform the elastomer so as to accomplish the purpose of water leakage prevention.

Abstract: A leak testing device includes a generally cylindrical elongated sealing gasket which defines a recess therethrough. The gasket includes first and second end portions for receiving the respective ends of two adjacent conduits. A shoulder portion extends radially into the recess for supporting a diaphragm member thereon. The diaphragm member includes a diameter substantially corresponding to the diameter of the recess. In a preferred embodiment, the diaphragm member is made integral with the gasket. A hole is provided in the diaphragm member which can be selectively opened or closed by a valve assembly provided on the diaphragm member to thereby permit or restrict the flow of a fluid between the two conduits.

Abstract: A unitary removable barrier for installation in a cylindrical water line to selectively block the water line to passage of water therethrough. The unitary removable barrier is composed of a single piece body having at least one cylindrical section sized to receive upstream and downstream pipes of the water line. A unitary planar disc molded with the cylindrical section is of a circular circumference and which completely blocks the water line but which is selectively removable from the cylindrical section thus removing the barrier to the passage of the water through the line. Tabs are provided on both the upstream and downstream sides of the planar disc to facilitate its removal from either the upstream pipe or downstream pipe.

Abstract: An end cap for a corrugated conduit, attachable to the open end of conduit preferrably corrugated conduit. The end cap has a cylindrical skirt portion and an end piece, a plurality of inwardly-directed latching tabs spaced around the cylindrical skirt portion and which are springingly deflectable in a radially outward direction when the latching tabs are forceably urged over the corrugated conduit open end. The latching tabs spring inwardly when the diameter of the corrugated conduit decreases, thereby latching the end cap over the open end. The end cap may further have an arcuate configuration for the end piece where the cylindrical skirt portion has an inside diameter greater than the outside diameter of the corrugated conduit. The end piece may also have an axially-directed aperture with a center not centered on the axis of the corrugated conduit.

Abstract: A joint for a shaft assembly includes a housing fitted with a boot seal that encircles and seals about a stub end of a shaft extending into the housing. The boot seal has a collar-like neck portion whose inner surface is formed with an annular wiper rib. Prior to assembly with the shaft, a shipping plus is disposed in the neck of the seal to guard against the escape of grease and the ingress of contaminants. The wiper rib of the seal is operative to engage and wipe grease from the inserted shank of the shipping plug upon its removal to prevent the grease from accumulating in the neck region and impairing the performance of the seal.

Abstract: A pipe end fitting (13) has a cup-shaped body (15) for fitting on the end of a pipe (14), and gripping (20, 22) and sealing (18) assemblies that fit radially inside the pipe and the cup-shaped body and are radially expandable to engage the pipe interior. The gripping assembly includes a toothed expandable assembly (20) and an expansion mandrel (22) that is urgeable axially into the cup to expand the expandable assembly. This also axially compresses the sealing assembly (18), which is formed of at least two annular bodies (30, 34) and two sealing rings (42, 56). At least one body has a ramp surface (74, 76) that urges radial expansion of a sealing ring (42, 54) to seal to the pipe.

Abstract: A method and apparatus for testing a plumbing system in a more dependable and cost-effective manner. During the rough-in plumbing phase of construction, the drain pipe leading from the plumbing system in a building to the city sewer main or main sewer line is positively sealed off by a test cap or plug welded in the pipe at the location of the clean-out. Access to the test cap is maintained through the clean-out. Pressurizing the rough-in plumbing to test the same can then proceed knowing that if any leaks occur, they are in the branch plumbing on the building side of the test cap, and not at or in the test cap. Following successful completion of the initial test, the top-out plumbing job is completed, leaving the test cap welded in the clean-out or drain pipe. After the roof vents are in, the second test of the plumbing system is made, again knowing that if the system shows any leaks, they are the result of a failure in the plumbing work and not a failure of the test cap.

Abstract: A test plug for testing the integrity of a pipe includes a blind flange for mating with a pipe flange, a compression mandrel having a conical recess, an expander having a conical surface which mates with the compression mandrel and an elastomeric annular seal positioned between the compression mandrel and the expander. Removeable compression rings of different sizes may be attached to the test plugs and used with different sizes of annular seals. The expander is actuated by a rod which extends through the compression mandrel and to the exterior of the test plug. Installation of the test plug isolates and seals an end portion of the pipe. Fluid under pressure may then be pumped into the isolated segment to test for pressure integrity.

Abstract: The invention relates to a device for closing a pipe at its end side, particularly for closing the pipe so as to make it highly gas-tight, in order to obtain a simple closure of the pipe without the interior of the pipe not being contaminated when the pipe is removed. The device comprises a socket element one side of which is adapted to be attached to the pipe being closed, a closing element adapted to be placed on top of the other end of the socket element, and a clip for pressing/locking the closing element. The device according to the invention achieves a highly gas-tight metallic seal.

Abstract: An apparatus for adding coolant to a cooling system of a motor vehicle includes a cap with a resilient sleeve that expands against the inside wall of a radiator filler neck to provide an airtight connection. A valve attached to the cap controls the flow of air and coolant through the cap. A gauge on the cap indicates the pressure inside the radiator. A venturi assembly connected to the valve provides a source of vacuum for evacuating air from the cooling system. Thereafter, coolant is drawn through the cap by the vacuum created in the system.

Abstract: Apparatus for detecting a leak in a pipe, and determining the location of that leak, comprises a cover plate for an opening into the pipe to be tested, such as an end cap for threading onto the end of a pipe, the cover plate having an aperture through which extends a flexible hose having an inflatable bladder at its free end. The hose is calibrated from its free end and is pushed into the pipe through the aperture for a known distance, whereafter the bladder is inflated by air supplied under pressure to the hose, so as to seal the pipe between the bladder and the cover plate. Air under pressure is then supplied to the sealed portion of the pipe and the pressure drop within that sealed portion is monitored over a period of time. By repeatedly performing the method but each time moving the hose further into the pipe, the location of the leak may accurately be determined.

Abstract: A tub waste overflow assembly that is attachable to a tub wall by means of a threaded retaining body insertable through an overflow drain aperture in a tub wall to engage a cooperatively threaded pipe fitting on the opposite side of the tub wall. The retaining body is provided with an annular flange larger than the aperture, a plurality of lugs circumferentially spaced around the tubular bore and extending forwardly of the flange, opposite the male threaded end, and a selectively removable test plug molded in place across the tubular bore at the flange end.

Abstract: A tub waste overflow assembly that is attachable to a tub wall by means of a threaded retaining body insertable through an overflow drain aperture in a tub wall to engage a cooperatively threaded pipe fitting on the opposite side of the tub wall. A chamfered washer is provided to cooperate with the retaining body and an annular sealing gasket to produce a fluid-tight seal on the interior surface of the tub wall. A forwardly projecting fulcrum member on the pipe fitting preferably contacts the exterior tub wall outwardly of the aperture to facilitate connection of a drain pipe to tub walls over a range of included angles, and no seal is required around the overflow drain aperture on the exterior tub wall. A unitarily molded, knock-out test plug is provided across the bore of the retaining body and a handle desirably attached to the test plug projects into the tub to facilitate installation.

Abstract: A closure for an opening extending through a tubular member, the opening having a first cylindrical surface of a first internal diameter and a second cylindrical surface of an enlarged internal diameter providing a circumferential ledge, and, in the second cylindrical surface an increased internal diameter circumferential slot, the closure being formed of a cylindrical plug removably positioned within the tubular member and in engagement with the circumferential ledge and including an expandable snap ring having a collapsed and an expanded condition and receivable when in the expanded condition within the circumferential slot to capture the plug between the circumferential ledge and the snap ring. In one embodiment the snap ring is a unitary circumferential member having opposed, spaced apart first and second ends and wherein the snap ring is radially inwardly collapsed by moving the first and second ends towards each other.

Abstract: The present invention discloses a pressured O-ring type sealing system which allows for effective seals without expensive and time consuming machining of the sealing surface. The O-ring sealing system of the present invention allows the sealing member to conform to the natural surface irregularities of the sealing surface and to compensate for any eccentricities between the plug and the inner diameter of the member being sealed.

Abstract: A disposable plug for installation in a cylindrical water line to temporarily block the water line to the passage of water therethrough. The disposable plug includes a cylindrically shaped tablet having a diameter substantially equal to the diameter of the water line so that when installed within the water line, water is prevented from passing the disposable plug. The cylindrically shaped tablet is characterized as being at least partially dissolvable when contacted with water. A water impermeable membrane surrounds at least a portion of the cylindrically shaped tablet to selectively prevent water from contacting it as long as the disposable plug acts to temporarily block the water line. The water impermeable membrane can be selectively disrupted allowing water to contact the cylindrically shaped tablet to selectively remove the disposable plug when no longer needed.

Abstract: A two piece mechanical plug assembly for sealing low pressure pipelines. The mechanical plug assembly comprises a rigid body member and a flexible, cylindrical sealing member. The rigid body member has an upper portion and a lower portion of a frustoconical configuration having a plurality of threads. The sealing member has a conical bore with a plurality of threads to receive the lower threaded portion of the rigid body member. The upper portion of the rigid body member has an upwardly extending member with opposing wing members for turning the rigid body member into the sealing member whereby the rigid body member expands the flexible sealing member for sealing engagement into the interior of a pipeline.

Abstract: An apparatus for adding coolant to a cooling system of a motor vehicle includes a cap with a resilient sleeve that expands against the inside wall of a radiator filler neck to provide an air-tight connection. A valve attached to the cap controls the flow of air and coolant through the cap. A gauge on the cap indicates the pressure inside the radiator. A venturi assembly connected to the valve provides a source of vacuum for evacuating air from the cooling system. Thereafter, coolant is drawn through the cap by the vacuum created in the system.