Abstract: A wiper device has a pair of pivot holders each of which supports a pivot shaft and a pipe frame that connects the pivot holders to each other. When each pivot holder is fitted in an end of the pipe frame, the pipe frame is subjected to caulking to engage the pipe frame with recesses that are formed in the surfaces of the pivot holders. Each recess is shaped and located such that the open angle of the recess is constantly greater than zero and equal to or greater than the shaft angle of the corresponding pivot shaft, as viewed along any cross-sectional plane that includes a normal line corresponding to a maximum depth portion of the recess. As a result, the pivot holders are secured to the pipe frame easily and reliably, and the pivot holders are manufactured with a reduced cost.

Abstract: A mechanical connection for tubular members has a male tubular member with a distal end portion containing an O-ring. A female tubular member fits over the male member in sealing engagement with the O-ring, so that the O-ring is only radially compressed. The female member is crimped or compressed on to the male member, such that engaging ribs and grooves in the male and female members lock the members together against axial relative movement. The crimping operation does not affect the O-ring seal because the ribs and grooves are spaced axially from the O-ring seal.

Abstract: A threaded joint to be expanded, including a lip at the end of the male element end a housing for the lip on the female element to make the threaded joint capable of being sealed and of having a maximum internal passage cross-section after being subjected to diametral expansion by more than 10%. The free male end surface is socketed before expansion into a partially transverse shoulder surface of the female housing through the matching rebating shapes of the surfaces. And, the male lip outer peripheral surface is arranged with little play of the internal peripheral surface of the female housing. Such a threaded joint is particularly useful for casings and tubings used in oil wells.

Abstract: A fitting for a fluid pressure conduit. The fitting includes a coupling body having a substantially axisymmetrical inside surface for engaging an outside surface of the fluid pressure conduit. The inside surface has at least one substantially axisymmetrical seal formed as at least one axisymmetrical ridge on the inside surface of the coupling body. There is at least one seal land on an outside surface of the coupling body adjacent the substantially axisymmetrical seal(s). There are a plurality of anti-torsion ridges on the inside surface of the coupling body, the anti-torsion ridges having friction surfaces for resisting torsion between the fitting and the fluid pressure conduit. Furthermore, there is at least one torsion land formed on the outside surface of the coupling body adjacent the torsion ridges.

Abstract: A fitting assembly for fluid and vapor connection comprising a first tube, a second tube and a thin strip of polymeric material. A male member is formed at the end of the first tube. A hollow female body is formed at end of the second tube. The male member is received in the female body. The strip of polymeric material has a layer of adhesive applied to one surface of the strip. The strip is bonded to the male member and unbonded to the female body. The strip is compressed between the male member and the female body.

Abstract: In a hose with corrugated metal tube, an axial leading end portion of a corrugated metal tube is configured as an extending portion so as to extend in an axial direction beyond a base portion of a socket fitting and be exposed out of an outer layer of the hose. The extending portion is clamped by an inner end surface of the base portion and an outer surface of a rigid insert pipe.

Abstract: The present invention provides a connector arrangement for connecting a first tubular to a second tubular. In particular, the present invention relates to a method for connecting tubulars in such a way that the connection is prevented from becoming unmade in response to expansion of the tubulars in a wellbore. More particularly, the present invention provides a tubular connection using a helical or spiral thread insert to seal and maintain mechanical strength in a tubular connection after expansion.

Abstract: A plastic pipe coupling system including a female coupling and a support ring. A circumferential groove is molded or cut into the outer diameter of a plastic pipe. The female coupling includes a reduced diameter portion with a coupling rib at the free end. The ends of the pipe, coupling, and support ring are beveled in order that the ends pressed together engage and by the slight resiliency of the plastic construction permit the slight expansion and contraction of the ends to provide a locking interfit of the respective groove and rib at the two ends. There is an interference fit between the support ring and the coupling so that a radial preload is induced when the support ring is assembled onto the coupling. The inner surface of the sleeve or the outer surface of the coupling is tapered for ease of installation of the support ring over the coupling and to provide radial support to keep the coupling in the groove.

Abstract: A clamp for clamping two concentric tubes, typically two concentric tubes in an oil or gas well. The clamp has two axially movable tapered components which can be pulled over one another in an axial direction to provide a contraction of internal diameter which grips the smaller diameter tube. In one embodiment, a spacer is fitted to allow the tapered components to be held apart until the tubes have been correctly positioned. The spacer is then removed, and the tapered components are drawn together to effect the clamping. A hydraulic ram can be provided to separate the tapered components should readjustment be required. In another embodiment, the larger diameter tube is made with a relatively thin wall, so that it can be distorted inwards to grip the smaller tube.

Abstract: A pipe joint assembly includes a cylindrical pipe and a pipe element having a generally cylindrical terminal portion for receiving the end of the pipe. The terminal portion is formed with a roughly straight open ended channel extending in a direction tangential to, but intersecting, the cylindrical pipe. A lock pin is insertable along the open ended channel so as to cause local inward deformation of the end, thereby locking the end and the pipe element together. The lock pin has a parallel-sided shaft portion of minimum transverse dimension d and a tapered portion of length l tapering to a point, where l is no less than twice d and is no greater than four times d. This geometry facilitates insertion of the lock pin through a combined linear and rotational displacement which is highly effective for ensuring effecting and reliable interconnection.

Abstract: An apparatus and method for attaching a tube member to a housing of a vacuum brake booster is provided. A tube member includes a body portion, an outer surface, a first end, and a second end. A first collar portion is disposed between the first end and the body portion, and extends outward from the outer surface. A lip portion is disposed at the first end and extends outward from the outer surface. The first collar portion and the lip portion define a recess to receive a first housing member. The tube member may further include a second collar portion spaced apart from the first collar portion and extending outward from the outer surface. The second collar portion may preferably define a contact surface for contacting an inner surface of a second housing member.

Abstract: The invention relates to a connection of a metal pipe with a metal sleeve by means of cold-pressing deformation. The metal sleeve on its inside shell is provided with a pipe limit stop and the portion of the sleeve to be connected with the pipe end, along its inside shell, exhibits deformations before the pressing process. In one embodiment, the deformations of the inside shell of the metal sleeve are formed as ribs extending around the axis of the sleeve. The ribs on the inside shell of the metal sleeve are spaced at varying distance from each other. In another exemplary embodiment, the deformation of the inside shell of the sleeve has a convex curvature so that a frictionally-engaged connection is created after pressing.

Abstract: A thread for expandable downhole tubular connections is disclosed. It features a locking pattern on the pin and box, which engages upon expansion of the connection. The locking pattern compensates for longitudinal shrinkage away from a torque shoulder, as a result of expansion. A resilient seal can be incorporated into the design with pin to box clearance disappearing around the seal as a result of expansion. Resilient seals can be used in tandem to trap atmospheric pressure between them. The wellbore hydrostatic pressure helps engage the locking feature by pushing the box into the pin, helped by the trapped low pressure between the seals.

Abstract: A radially expandable tubular connection including a box member having an internal thread and a first seal surface and a pin member having an external thread and a second seal surface. The external thread threadedly engages the internal thread and the first and second seal surfaces form a metal-to-metal seal upon engagement of the seal surfaces. At least one groove is formed on an outer surface of the box member, and the at least one groove is shaped so that the box member radially deforms in a direction toward the pin member in a region near the metal-to-metal seal after radial plastic expansion of the pin and box members after engagement of the threads.

Abstract: A coupling comprising a tubular inner member (9) defining a socket dimensioned to receive a pipe to be connected to the coupling. The inner member (9) is positioned within a tubular body (1) to define a closed annular chamber, and an inlet (2) is provided tough the body so as to communicate with the chamber. In use, pressurised fluid such as a setting resin is introduced through the inlet (2) into the chamber. The pressure of the introduced fluid is sufficient to cause the radially inwards deformation of the tubular inner member (9) so as to grip the pipe (13, 14) which is received within the socket. Pressure may be applied up to a predetermined limit, or until seal failure.

Abstract: A connection head at a connection end of a thick wall steel pipe has an outer end face formed as a truncated cone or a truncated sphere. A lower neck portion is formed at the rear of the connection head and has a cylindrical outer surface and a taper to the outer surface of the pipe. A connection washer covers the lower neck portion of the connection head. A shallow gently sloping annular groove is produced inside the connection head as a result of a press forming. The above structure can prevent fatigue fracture due to stress concentration at the annular groove inside the head and sticking of a nut to the washer due to excessive tightening torque.

Abstract: The present invention includes a pre-assembled, high-pressure coupling interface adapter for use with a non-threaded port of a female member. The adapter comprises a generally cylindrically shaped metal body including a central longitudinal channel and an inner and outer surface. The body includes an external segment having an external end and an internal segment having an internal end, the internal segment configured for receipt within the port of the female member. The inner surface of the body is configured to engage and secure one or more external features of a separate male coupling member. The present invention also includes a coupling assembly including a coupling adapter and a method for forming a female coupling assembly including an adapter.

Abstract: A fitting or a mounting part, particularly for the connection with a tube-shaped component, comprises an end section, which can be pressed together for establishing a connection. At the end section, a ring-shaped elevation is arranged in which a sealing ring is disposed. According to the invention, a bulge is provided on the elevation. By means of the bulge, a space is formed between the sealing ring and the wall of the end section, such that a fluid can flow between the tube-shaped components. Only by pressing together this leaky point, will a sealed-off connection arrangement be established.

Abstract: The invention relates to a process for connecting a pipe (2, 31) in the region of its pipe end to a pipe coupling (1), comprising at least one support sleeve (3) with engagement elements (5, 65, 67, 124), in which context the pipe (2, 31) and the support sleeve (3) are first pushed into one another, the pipe (2, 31) then being pressure deformed, thereby bringing about a form-fitting connection with the engagement elements (5, 65, 67, 125) and bringing about a sealing relationship with sealing surfaces (7, 66, 68, 122), mutually adjoining each other in axial direction. The process is characterised in that an axial force, bearing on the sealing surfaces (7, 66, 68, 122) is applied to the pipe (2, 31) by way of a spring device (20, 52) deriving support from the pipe coupling (1) and that a facility for expansion is provided for the pipe (2, 31) on the side of the engagement elements (5, 65, 67, 125) oriented towards the pipe.

Abstract: The present invention relates to a junction in a pipe for connecting the pipe (1) into fluid communication with a fluid-carrying component (18), the junction comprising an opening (2) provided in the wall of the pipe and a connecting part (3) comprising a tube-clamp-like joint (3) comprising a first part (4) and a second part, which can be tightened against the first part by means of tightening means (6) and which comprises a narower first portion (10) and a broader second portion (11), whereby the narrower portion is positioned in the opening (2) and the broader portion outside the pipe (1). The invention also relates to a method of forming to the wall of a pipe a branching for receiving a fluid-carrying component.

Abstract: A thread for expandable downhole tubular connections is disclosed. It features a locking pattern on the pin and box, which engages upon expansion of the connection. The locking pattern compensates for longitudinal shrinkage away from a torque shoulder, as a result of expansion. A resilient seal can be incorporated into the design with pin to box clearance disappearing around the seal as a result of expansion. Resilient seals can be used in tandem to trap atmospheric pressure between them. The wellbore hydrostatic pressure helps engage the locking feature by pushing the box into the pin, helped by the trapped low pressure between the seals.

Abstract: A conduit connection joint is formed to connect a tube and a fitting body in fixed fluid tight relation. The joint is made by compressing the tube in a bore in the fitting body so as to cause formation of at least two beads in the tube during the engagement of the tube to the bore wall. A retaining ridge may be formed in the fitting body to further hold the fitting body and tube in engaged relation.

Abstract: A device for connecting a pipe socket, a tubular mounting part or a fitting (3) to a pipe (10), especially a water pipe. The inventive device comprises a connecting part (7). A first end (7a) of the connecting part is to be connected to a pipe (10) by a press connection, and a second end (7b) of the connecting part is to be connected to the pipe socket, mounting part or fitting (3). The second end (7b) of the connecting part (7) forms a plug-connection with a receiving part (4) of the pipe socket, the tubular mounting part or the fitting (3). After the press-connection is provided, the connecting part (7) is merely plugged in to connect a pipe (10), for example, to a mounting part.

Abstract: An annular claw, which extends outwardly from a joint block, is crimped over a flange of each pipe, so that engaging recesses of the joint block are engaged with the flange of the pipe, and thus each of the engaging recesses deforms and interlocks with a corresponding opposed portion of the flange of the pipe. As a result, rotation of the pipe relative to the joint block is effectively restrained.

Abstract: An improved crimp joint for joining components of gas or fluid distribution systems is disclosed. The joint is particularly suited for use with components made from low ductility materials including die cast metals. The joint comprises a flange formed by a first joined component and a second component that defines a second mating surface and a lip that is configured to closely surround at least a portion of the flange when the flange is positioned adjacent to the second mating surface. The joint is formed by deforming the lip to overlie the flange, capturing the flange between the deformed lip and the second mating surface. The flange includes a bead formed near the periphery of the flange on a surface against which the lip is deformed to abut to form the crimp joint. The bead is sized to deform and engage the lip thereby increasing the strength of the crimp joint.

Abstract: In a non-detachable press fit arrangement between an end portion of a metal pipe and a socket of a fitting, the socket defines an interior space and is formed with an annular anchoring groove which faces the interior space for receiving a sealing ring. The press fit arrangement includes at least one holding element secured to the socket and cold formed together with the socket, whereby the holding element at least partially penetrates the material of the end portion of the metal pipe to realize a positive fit with the metal pipe.

Abstract: A device for inflating an airbag has a gas generator. A gas generator housing can be anchored to a vehicle body. An end of an inflation tube is connected to a gas discharge socket fastened to the gas generator housing in an axially aligned and gas-tight manner. The tube end and the gas discharge socket are connected via a covering sleeve that bridges a gas-tight connection between the inflation tube and the gas generator.

Abstract: An apparatus and method for attaching a tube member to a housing of a vacuum brake booster is provided. A tube member includes a body portion, an outer surface, a first end, and a second end. A first collar portion is disposed between the first end and the body portion, and extends outward from the outer surface. A lip portion is disposed at the first end and extends outward from the outer surface. The first collar portion and the lip portion define a recess to receive a first housing member. The tube member may further include a second collar portion spaced apart from the first collar portion and extending outward from the outer surface. The second collar portion may preferably define a contact surface for contacting an inner surface of a second housing member.

Abstract: A method of connecting two malleable pipes comprising locating the pipes, one inside a portion of the other with O-rings between the pipes, and applying a crimping tool to inwardly deform the pipes and thereby cause the O-rings to deform and establish a fluid tight seal between the pipes.

Abstract: A plug-in coupling having a base body (6), a sealing ring (12, 13), a locking ring (40) and an annular body which can be connected to the base body (6). A pipe end (4, 5) can be locked in position by the locking ring (40). The plug-in coupling of the invention enables a connection to be made with at least one pipe end in a simple, functionally reliable manner, in such a way that pipes made of different materials can be used together. The pipe ends (4, 5) can be inserted into an axial annular gap or space (27) between the base body (6) and the annular body (18, 19) in such a way that the sealing ring (12) lies adjacent the interior of the pipe end (4, 5), making a good seal with the pipe end, and also in such a way that the locking ring (40) is located in the annular gap (27). The locking ring (40) is prestressed and adjoins the locking surface (20) of the annular body (18) on one side and the exterior surface of the inserted pipe end (4, 5) on the other side.

Abstract: A tubing connector non-releasably connected to a tube of tubing string for use downhole in oil and gas well operations, the connector comprising connector body (1) with an end portion fitted concentrically within or over a corresponding end of the tube (2), the end portion having a plurality of depressions (12) coinciding with corresponding depressions (10) on the corresponding end of the tube (2) whereby the connector body (1) and tube (2) are connected together, the depressions (10) and the tube (2) having been formed by localized plastic deformation of the walls of the tube (2).

Abstract: A metallic press fitting element for providing a non-detachable, tight joint of pipes includes a main body which is defined by a longitudinal axis. The main body is comprised of a radially outwardly projecting bead area at an entry side of a pipe to be inserted, a first cylindrical portion extending inwardly, at a distance to the entry side, of the bead area and connected thereto via a slanted transition, and a second cylindrical portion extending inwardly of the first cylindrical portion at formation of a stop surface for the pipe being inserted. The bead area terminates in a straight end portion which extends perpendicular to the longitudinal axis in a radial direction and has a terminal end which bounds a circular opening.

Abstract: A fitting for joining pipes, tubes, or conduits improves coupling capability particularly to a large bore pipe, generally of 2 inches and larger in diameter. The fitting includes a substantially cylindrical sleeve and ring. The sleeve has an inner surface defining a bore, configured to slidably receive the pipe at an open end. The inner sleeve surface also includes protrusions, which deform the outer surface of the pipe upon swaging. The fitting also includes an outer surface having multiple stepped lands of ascending height relative to the open end. The ring has an inner surface configured to engage the multiple ascending steps on the inner sleeve surface. The inner surface of the ring has descending steps that are positioned to interfere with the multiple ascending steps on the outside of the sleeve. Axial motion of the ring causes the ring to slide over the sleeve and apply a radial swaging force directly to the multiple stepped sleeve.

Abstract: A coupling comprising a swivel stake nut or other connecting end portion rotatably coupled to a stem portion, and a jam nut or other stabilizing apparatus mounted upon or otherwise attached to one of said connecting end portion and stem portion in stabilizing relation to the other thereof, for inhibiting axial, rocking and/or rotational movement of the components during pressurized operation of the device with impulse cycling when coupled to hose or other fluid transfer component and an associated equipment port, in the absence of a separate adapter.

Abstract: A preassembled fitting including a body, a nut and a collet positioned within the nut. The nut is threaded on the body a predetermined distanced to allow the installer to snap the corrugated tubing into the nut and engage the collet. The nut is then further tightened to seal the body to the corrugated tubing. A tapered surface on the body engages the cut end of the corrugated tubing and flares the cut end of the corrugated tubing. The fitting will make a metal to metal seal by folding the convolutions of the tubing back against itself creating a double flare.

Abstract: A pressure fluid conduit coupling fitting and method of making same, wherein the nipple tube fitting shank is made of specially grooved rigid material. A conventional elastomeric hose conduit having an open end telescopically receives the grooved fitting shank, and a conventional crimp-collar is sleeved over and shrunk-deformed onto the hose open end to permanently sealably secure the coupled conduit connection. An external circumferential surface of the fitting shank has one or more circumferentially continuous sharp edge external grooves of a shallow depth and predetermined width that are defined by the shank ribs formed between the grooves. The junction of the groove sidewalls with the respectively adjacent shank rib surface defines a circumferentially continuous sharp edge formed generally as a 90° junction of these groove sidewalls and rib surface, plus or minus a few degrees.

Abstract: A method and arrangement is provided to form a gas-tight joint between two housing portions, e.g. between an end flange and a tubular pole-unit housing for a circuit interrupter or an insulating support column. The joint is formed via a heat-shrink process to provide an interference fit. The housing is provided with grooves to retrain adhesive during the assembly process.

Abstract: A gas valve assembly for use with a gas grill includes a t-shaped manifold with an inlet fluid port that branches out into a pair of valve ports. A pair of gas valves each have an outwardly extending neck that is received within the valve ports of the manifold. A stop means locates the valves a predetermined distance from one another to improve manufacturability. An anti-rotation means minimizes rotation between each valve and the manifold.

Abstract: A pipe fitting (1) for pipes (2) exhibiting a coating (5) having a high mechanical and/or chemical resistance, comprises a first tubular portion (6) adapted to be connected to the pipe (2), to which there is connected a second portion (8), adapted to the connection with another pipe fitting (1).

Abstract: A clamp assembly prevents separation of a thermal sleeve penetrating a nuclear reactor pressure vessel wall and a jet pump riser elbow welded one to the other and lying within an annular space between the pressure vessel wall and core shroud. The clamp assembly includes a pair of heads having semi-cylindrical recesses. Pins project inwardly from each of the heads in the semi-cylindrical recesses and have axes which lie parallel to one another. By using actuators mounting multiple electrodes, holes may be formed in situ in the adjoining ends of the thermal sleeve and elbow. Once the holes are formed, the heads can be applied in situ with the pins being received through the holes and the heads clamped to one another. Thug, the pins in each of the sleeve and elbow prevent separating movement of the sleeve and elbow in the event of failure of the welded joint therebetween.

Abstract: A fitting assembly for fluid and vapor connection comprising a first tube, a second tube and a ring. The first tube has a male member at the end of the first tube and a radially enlarged upset formed at a distance from the end of the first tube. The second tube has a hollow female body formed at the end of the second tube. The male member is received in the female body. The ring surrounds the female body. The ring has an axial bore with an innermost diameter smaller than the outermost diameter of the female body for deforming the female body radially inward. The innermost diameter of the axial bore is smaller than at least a portion of the upset of the first tube.

Abstract: A tubing connector for joining the ends of two lengths of expandable tubing including two expandable tubular portions for mounting on the ends of the lengths of expandable tubing. Each portion includes a plurality of circumferentially spaced couplings for engaging corresponding couplings on the other portion. The engaging parts of the couplings are located on parts of the tubular portions which define an upset following expansion.

Abstract: A conduit mounting device for entrapping a conduit that includes a body having a U-shaped channel formed longitudinally through the body. The U-shaped channel receives the conduit therethrough and defines a leg on either side of the U-shaped channel. A retainer insert is mounted transversely in the U-shaped channel to sandwich the conduit between the retainer insert and the body in the U-shaped channel. The legs of the body are folded behind the retainer insert in the U-shaped channel to transversely entrap the retainer insert and conduit in the U-shaped channel. A device for further longitudinally retaining the retainer insert within the U-shaped channel, in addition to a device for rotatably locking the conduit within the U-shaped channel, may also be provided.

Abstract: The invention concerns a telescopic tube (10), in particular for sprinkler systems, comprising an outer tube (12) and an inner tube (14) which is movable relative to the latter and has an inner end piece (36) which extends inside the outer tube and has an outer diameter which is larger than the inner tube in their adjoining regions. The telescopic tube (10) further comprises a securing element (26) which surrounds the inner tube and is provided for the outer tube, the outer end (22) of the latter extending in said securing element (26). According to the invention, in order to provide a precise connection between the inner and outer tubes using precision screw machine parts in particular, the outer end (22) of the outer tube is widened and extends inside an annular mounting (24) of the securing element which in turn comprises an outer edge (34) which extends externally along the outer tube and is deformed in the direction of the outer end of the outer tube when the latter has been fitted in the mounting.

Abstract: A conduit connection joint is formed to connect a tube and a fitting body in fluid tight relation. The joint is made by axially compressing the tube in a bore in the fitting body so as to cause formation of an outwardly extending tube bead and at least one inwardly extending tube bead. The engagement of the fitting body and the tube may be further strengthened by a retaining ridge. The retaining ridge may be formed in the fitting body to engage the outwardly extending tube bead to further hold the fitting body and tube in engaged relation.

Abstract: A gas valve assembly for use with a gas grill includes a t-shaped manifold with an inlet fluid port that branches out into a pair of valve ports. A pair of gas valves each have an outwardly extending neck that is received within the valve ports of the manifold. A stop means locates the valves a predetermined distance from one another to improve manufacturability. An anti-rotation means minimizes rotation between each valve and the manifold.

Abstract: A metal hose comprises a metal tube having an annularly corrugated wall, a fitting body, an extension that projects from the fitting body, and a sealing member. The fitting body defines a sealing seat for the sealing member. The extension projects from the body about the tube and defines a corrugation positioner distal the fitting body. The extension is deformed to shift the corrugation positioner toward engagement with the tube and resiliently compress the tube corrugations between the positioner and the sealing member. The resiliently compressed corrugations urge the sealing member against the seat for sealing the juncture of the fitting and the tube. In one embodiment a reinforcing shroud surrounds the tube and extends into the fitting. The fitting secures the shroud in place. The corrugation positioner compresses the tube corrugations through the shroud so the shroud is clamped and secured in place by the positioner at a location spaced axially from its end within the fitting.

Abstract: A pipe coupling axially connects two pipes having a smooth outer surface. The pipe coupling includes a first split circular ring and a second split circular ring. The first and the second split circular rings are made from a metal strip. Each of the strips have a radially inner edge surrounding the ends of the pipes. A plurality of teeth are disposed at the radially inner edge of the strips. The teeth are disposed in the plane of the respective rings. A free end of the tooth penetrates into the pipe when the coupling is in the clamped position. The teeth extend at an angle relative to a longitudinal axis of the pipes. A side of each of the teeth facing toward the pipe inserted in the coupling have, adjacent to the free end of the tooth, at least one indentation. The indentation displaces the material of the tooth on the side of the tooth in the direction toward the free end of the tooth.

Abstract: A quick connector of the ball-lock type includes a socket member, a plug member and a slidable sleeve which are specifically designed to permit manufacture by deep drawing of a sheet metal. The socket member and the plug member are each shaped in the form of a stepped tube and the plug member is inserted into the socket member in a telescoping fashion to form an annular chamber therebetween. An O-ring and a backup ring are mounted within the annular chamber by inserting them into the bore of the socket member.

Abstract: A metal pipe fitting and a method of fitting pipes together, the metal fitting having at least one mouth opening for receiving a mating length of metal pipe. The pipe fitting comprises a generally cylindrical sleeve having an exterior surface, interior surface, and a proximate end and a distal end. The proximate end forms at least one mouth opening for the fitting. The sleeve has a circumferential groove formed within the interior surface between the proximate and distal ends thereof and a seal ring located within the circumferential groove. There is at least one inspection divet which penetrates the exterior surface of the sleeve to the interior thereof to reveal the exterior of the mating length of metal pipe for verifying the proper insertion of the metal pipe.