Abstract: A method and a device for bending a metal hollow thick walled member to a predetermined angle without deviation of the bending center position and without separation from a half die when presser die moves up. With a pair of guide plates (GP1 and GP2) turnably attached to a center pin CP kept horizontal and the axis center of the center pin intersecting with the axis center of the metal hollow thick walled member PM, the member PM is mounted on a half die (82a). When die holding members (80a and 80b) fixedly connected to the above guide plates and kept horizontal are inclined and separated from each other as the center pin lowers, the member PM is bent to the predetermined angle and held on the half die (82b). When the center pin that can be moved vertically by a guide member moves down to a predetermined position, a contact portion (96b) contacts the inclined surface of a stopper (92b) to allow a base plate (16) to receive a pressing force from an upper die via the stopper.

Abstract: An elbow barbed fitting for use with flexible pipe and the like is provided with a barbed fitting drive cap for cooperating with a compatible drive tool, such as a socket or nut driver. The barbed fitting drive cap is configured as a hexagonal cap, square cap, star cap or other common driver shapes. The barbed fitting drive cap is positioned on the fitting body opposite the opening to the barbed end, but coaxially aligned with the barb. The cross-sectional body width of the barbed fitting drive cap is narrower than a corresponding width of the fitting body for exerting a drive force on the fitting body. Alternatively, the elbow barbed fitting is provided with a drive recess configured as a hexagonal recess, slotted recess, cross point recess, square recess, star recess or other common driver shapes for cooperating with a compatible driver. Common elbow fitting types include 90° or 45° ells.

Abstract: This variable-angle tubular connection includes a first tubular section (4) which has a flange ring (10), a second tubular section (6) which has an end flange (12) and a clamping device (8) for clamping the flange ring (10) against the end flange (12). The clamping device (8) has at least one linking segment (22), suitable for being applied against the flange ring (10), and components (24) for clamping the linking segment (22) against the flange ring. The end flange (12) has traversing recesses (20) through which the clamping components extend. The end flange is fixed to the second tubular section (6). Application to the sealed junction of tubing elements.

Abstract: The invention relates to a piping apparatus for carrying a cooling or lubricating medium in a transmission or an engine, preferably in a vehicle, with a pipe for carrying a medium and at least one outlet opening for conducting the medium out of the pipe. It is distinguished by virtue of the fact that the piping comprises multiple standardized piping elements (12), that at least one piping element (12) is a piping element having an outlet opening (14), and that the piping elements (12) are made from a plastic. The invention further relates to a modular system for the construction of such a piping apparatus.

Abstract: A high-pressure hose hinge assembly provides a continuous fluid path between first and second components that move relative to each other. The hose hinge assembly includes a plurality of rotatable swivel fittings that couple a plurality rigid pipe sections. A first swivel fitting is fixedly coupled to the first component and another swivel fitting is coupled to the second component. At least one swivel fitting and two rigid pipe sections extend between the swivel fittings coupled to the first and second components to provide a continuous fluid path.

Abstract: A direction control means for apparatuses for cleaning submerged surfaces in the form of an elbow joint with swivel connections at each end. The connections may include anti-friction surfaces.

Abstract: A reinforced pipe fitting has a body with a cylindrical first section and a cylindrical second section. The first section has a first longitudinal axis and the second section has a second longitudinal axis. The side walls of the first section intersect the side walls of the second section at a crotch point disposed within the plane defined by the first and second longitudinal axes. The first section defines a first section crotch area pipe stop having a proximal portion disposed proximate to the crotch point and a distal portion disposed opposite the proximal portion. The average thickness of the proximal portion disposed 15° to either side of the plane defined by the first and second longitudinal axes is greater by about 15% than the average thickness of the distal portion disposed 15° to either side of the plane defined by the first and second longitudinal axes.

Abstract: A fuel port elbow composed of a plastic port body overmolding an electrically conductive, truncated insert tube such that there is no external dissimilar materials boundary. The tube has a tube first segment, a tube elbow segment and a tube second segment truncated such that the dissimilar materials boundary at the tube truncation is internal to the port body. A port body is integral with the plastic of a flange cover, and overmolds part of the tube first segment and all of the tube elbow and second segments. The port body has a port body second segment having a port body passage communicating with the tube passage and extending remotely from the tube truncation, being adapted for connecting with a fuel line.

Abstract: A fluid delivery adapter unit for selectively connecting fluid supply equipments to an endoscope that includes a straight pipe capable of being detachably coupled to a fluid inlet collet of a headpiece of the endoscope and a generally L-shaped elbow pipe having a LUER-LOK® lock component at a proximal end to which the fluid supply equipment is coupled. A joining structure is installed between the elbow pipe and the straight pipe so as to allow the elbow pipe and the straight pipe to turn through a predetermined angle relative to each other only when the elbow pipe is forced to turn and further to keep them in a turned position while the elbow pipe is unforced. The joining structure includes an elastic sealing member to provide fluid tight seal between the elbow pipe and the straight pipe.

Abstract: An elongated air intake manifold, for coupling a compressor outlet to the air intake of an internal combustion engine, includes bottom, top and side walls progressing from a circular upstream end through a sweeping curved central section to a 90° bend section terminating in a peripheral rim surrounding an air outlet port. The peripheral rim has opposed proximal and distal sides and a lower surface facing the engine air intake opening. A pair of proximal and distal mounting screw receptacles are formed integrally with and located on the interior and exterior of the manifold, respectively, for receiving mounting screws to secure the manifold to the engine. Preferably, the proximal mounting screw receptacles are arranged so that the heads of the mounting screws extend a minimum distance into the manifold interior. Optionally, one or more turning vanes may be positioned in the bend section interior of the manifold.

Abstract: A joining method wherein ends of multilayer composite tubing and/or fittings having at least one middle layer of malleable metal are flared radially outwardly so that exposed ends of the middle layer of malleable metal are directed radially outward and away from a fluid flow path within the tubing and/or fittings. The flared-out ends are then fused using infrared butt welding so that the resulting bead protrusion into the fluid flow path is small enough to be acceptable for use in a high purity water system.

Abstract: A building inside fire extinguishing system, the building having a standard roof pitch and corresponding peak angle. The system including a main water supply line extending along the base or lower margin of the roof and having spaced parallel upright pipe nipples attached to the main water supply line, a plurality of feed lines extending upwardly from the main water supply line parallel to the roof and a plurality of spaced water sprinkler heads operably attached to each of the feed lines. To interconnect the upper end of each upright nipple, an array of roof slope sprinkler fittings is provided, one of which is selected angularly matching the roof pitch. These sprinkler fittings each include an angled hollow body having a female threaded inlet and a female threaded outlet angularly oriented at different standard roof pitch angles one of which will equal the standard pitch of the roof. Each fitting is threadable directly to and between the pipe nipple and a lower end of the feed line.

Abstract: A pipe elbow for conditioning the flow of fluid through the elbow so that separate flow conditioners or a flow straightener need not be inserted between the elbow and a flow measurement device, comprising, a fluid carrying conduit elbow having first and second ends of circular cross section for connection to straight piping and having a bend intermediate the ends, wherein a lateral cross section of the conduit at the bend is elliptical in shape.

Abstract: A pipe fitting for connecting at least two pipes, the pipe fitting (1) comprising at least two layers. An innermost layer (2) and an outer layer (3) are of different materials. The innermost layer (2), which gets into contact the liquid to be conveyed, is made of plastic tolerating high temperatures. The outer layer (3) is formed of such materials that the outer surface is arranged to function as the provider of oxygen diffusion protection and/or the UV protector.

Abstract: A pneumatic swivel elbow is provided according to the invention. The pneumatic swivel elbow includes an internal passage extending through the pneumatic swivel elbow and substantially changing in direction. The pneumatic swivel elbow further includes a male coupling portion formed on one end and adapted to be sealingly inserted into and engaged with a corresponding bore of a mating component and being configured to sealingly rotate within the corresponding bore. The pneumatic swivel elbow further includes a conduit coupling portion formed on a substantially opposite end from the male coupling portion. The conduit coupling portion is configured to sealingly receive a pneumatic conduit and is configured to allow the pneumatic conduit to rotate within the conduit coupling portion.

Abstract: A hydraulic port weld stud that includes a stud portion having a longitudinal axis and a first bore formed along the longitudinal axis less than an entire length of the stud portion. A port portion extends along an axis transverse to the longitudinal axis of the stud portion. The port portion includes a second bore extending along the transverse axis and intersects the first bore of the stud portion. The port portion and stud portion are integrally formed without the need for a joining or welding operation.

Abstract: An object of the present invention is to provide a flange coupling in which the height of a horizontal portion of an L-shaped pipe is made as small as possible. The present invention provides a flange coupling having a flange formed with an attaching bolt hole and a pipe connection hole and an L-shaped pipe installed in the pipe connection hole, wherein the L-shaped pipe is made of aluminum or aluminum alloy, and a horizontal portion of the L-shaped pipe is molded so that a lower face thereof is at the same level as or at the level close to a plane including the upper surface of the flange.

Abstract: The invention relates to pipe bend (1) for a pipeline used in the fluidic transport of solids and to a method for producing the pipe bend. The pipe bend (1) includes a double-layer pipe body (2) comprised of an inner pipe bend (3) and an outer pipe bend (4). A coupling collar (6) is fixed to each pipe end (5) of the pipe body (2). The annular gap (8) between the inner pipe bend (3) and the outer pipe bend (4) is filled with concrete as filler (9). The annular space (8) is filled via a fill opening (10) in the wall (11) of the inner pipe bend (3), with the fill opening extending transversely across the wall and arranged on the inner radius IRi of the inner pipe bend (3). Centering aids (12, 13) are hereby introduced into the ends of the pipe body (2), and the inner pipe bend (3) and the outer pipe bend (4) are positioned in relation to one another by the inflation of the centering aids (12, 13).

Abstract: A connector tube for a heater core is shown, wherein the connector tube facilitates a connection to a plurality of heater core extension tubes having different geometries.

Abstract: An apparatus according to this invention for carrying hydraulic fluid in a power assisted automotive steering system, includes a tube having a tube wall formed with a first port that extends though a thickness of the tube wall. A housing includes a wall formed with a second port extending though a thickness of the housing wall. A retainer is secured to the housing. A fluid transfer line includes a first surface that contacts an outer surface of the tube, is formed with a passage communicating with the first port, is sealed against fluid flow past the first surface, and is secured to an outer surface of the tube. A second surface contacting the retainer is formed with a passage communicating with the second port, is sealed against fluid flow past the second surface, and is secured to the housing by the retainer.

Abstract: A small bend radius connector for a heater core is shown, wherein a first end of the connector has a rectangular cross section, a second end of the connector has a circular cross section, and wherein a size, a weight, and a cost of production of the connector are minimized.

Abstract: A half elbow used with a second similar half elbow clads insulation or other structures about a bend. Each half elbow is formed of separate segments of thin sheet material fastened together. Each segment includes first and second edges adapted to be fastened to corresponding second and first edges of adjacent segments. The segments are fastened together and shaped so that they form a curving contour between outside edges and inside edges of the segments. The outside edges of the segments together form an outside seam and the inside edges of the segments together form an inside seam. Two outside seams of two half elbows can be joined together along with two inside seams of the two half elbows to entirely surround and cover a bend.

Abstract: A wall-mounted elbow duct and particularly to a wall-mounted elbow duct to connect a wall-mounted water discharge pipe to a hand-held shower head mainly includes an elbow duct which houses a reverse checking mechanism and a coupler and a coupling cap. By means of the invention the hand-held shower head can be connected to the wall-mounted water discharge pipe without a great number of elements. An ornamental cover also is formed to conceal the connecting portion of the water discharge pipe to enhance aesthetic appeal.

Abstract: A liquid-tight electrical connector formed by a one-piece, zinc die cast member including a ferrule insertable into a conduit, and a sleeve body surrounding the ferrule to form a conduit receiving channel, the sleeve body having a strap section that can be drawn tight around a conduit to secure it in the channel.

Abstract: A Non-metallic Elbow Conduit Transition Fitting is disclosed. The fitting is specifically suited to interconnect vertical electrical conduit runs and horizontal electrical conduit runs in commercial construction environments. The fitting is suitable for immersion within poured concrete floors used in commercial building construction. The fitting is designed to threadedly engage a vertical run of EMT (metallic) conduit with a horizontal run of nonmetallic (e.g. PVC) conduit. A final aspect of the fitting is that it must have a short sweep angle bend so that it is adequately buried within a concrete floor made from 6 inches of concrete.

Abstract: An elbow fitting is used in a pneumatic product conveying system in which the fitting expands from the inlet pipe along the outer side of the elbow fitting to enable a layer of accumulated product particles to be formed so as to move at a lower velocity than the velocity of the incoming product stream while establishing a moving contact surface for deflecting incoming product particles toward the outlet pipe with a minimum of pressure resistance and product attrition. The accumulated product particles are discharged from the elbow fitting by incorporating a step in the outer surface of the elbow fitting to create a Bernoulli effect causing the accumulated product particles to enter the air flow after the incoming flow of product particles has ceased. The particles in the accumulated layer are replenished from the incoming flow during operation of the elbow fitting.

Abstract: An elbow for a dryer exhaust vent conduit. The elbow can have two nestable channel sections, each channel section having a generally C-shaped cross-section, which may be substantially semi-circular. Each channel section has a connection mechanism along at least one side such that the two channel sections are joinable to form a substantially tubular conduit which has a smooth interior surface, reducing friction losses to the airflow speed of the dryer exhaust. Each channel section can be curved in a large radius arc to provide a turn to the elbow, which may extend around a quarter circle to provide a 90° turn to the dryer exhaust vent conduit. Snap fit locking tabs may lock the two channel sections together. Ends of the elbow may fit into or outside adjoining conduit pipes. The channel sections can be nested for ease of transport and storage and can be easily assembled on site.

Abstract: A modular manifold system is provided for interconnecting fluid components of a fluid system in a reduced area The system is comprised of a one or more bridge fittings having an internal fluid passageway which has an inlet end in fluid communication with an outlet port of a first fluid component, and an outlet end in fluid communication with an inlet port of a second fluid component. The bridge fittings may be mounted within a channel of a backing plate for structural support. An optional locator plate may be utilized which is mounted over the ends of the bridge fittings in order to align the inlet and outlet ports of the fluid components with the inlet and outlet ends of the bridge fittings. The bridge fittings may also be mounted to the locator plate in multiple directions forming multiple flow paths. Additionally, the bridge fittings may be stacked to form multiple layers where bridge fittings of one layer may be in fluid communication with bridge fittings of another layer.

Abstract: A coupling for joining pipe segments together is disclosed. The coupling is derived from a standard fitting and has a housing with a socket and a first expanded region adjacent to the socket, a second expanded region adjacent to the first expanded region and a third expanded region adjacent to the second. A sealing member is positioned in the first expanded region, a retainer is positioned in the second expanded region and a support washer having transversely oriented radial and coaxial flanges is positioned adjacent to the retainer in the third expanded region. A lip turned inwardly on the second expanded region overlaps the radial flange and captures the support washer, retainer and sealing member within the coupling. The retainer has a plurality of radial teeth angularly oriented to engage a pipe and prevent its removal from the coupling.

Abstract: A ring member and ring members made of metal are tightened and installed to the outer circumferential surface of a body made of a resin material. Accordingly, the body is prevented from outward deformation. When a tube joint is used in a high temperature atmosphere, even if any force acts on a fluid tube in the direction to cause detachment from the tube joint due to any external force or the pressure fluid flowing through the inside of the tube joint, then the fluid tube and a connecting member inserted into the body are reliably prevented from disengagement.

Abstract: An externally threaded male hydraulic coupling member adapted for threaded and sealed attachment to a port body with a female port. The male coupling member having a tubular member with a threaded end, a bore extending through the member, a first cylindrical peripheral undercut portion longitudinally adjacent the threaded end, a series of intermediate external threads, and a second cylindrical undercut portion. The coupling member having a seal member and an annular ring member located in peripheral sealing contact with the first undercut portion. Wherein upon attachment, the seal member is encapsulated by the annular ring, the female port and the first undercut portion forming an annular chamber having a longitudinal extent greater than the seal member thickness. The coupling member also having a lock nut threadedly attached to the intermediate threads with a longitudinal end located between the annular ring and the intermediate threads.

Abstract: A fully formed flared portion is molded as part of the main body of the one embodiment of the fitting. The flared portion is inserted through the back side of a retaining cap. A collet assembly is assembled together around the smallest diameter of the tube fitting below the flare. The collet assembly is fitted into the top of a mating nut. The retaining cap is then snapped onto the top of the nut, completing the assembly.

Abstract: A swickle connector includes a connector body with an inlet end and an outlet end that is adapted for engagement with a sealing member of a sampling device or the like. The outlet end of the connector body includes a central axis. A clamping seat is associated with the connector body and includes an equilibrium point that is coincident with the central axis such that a clamping force acting on the clamping seat extends only in the direction of the central axis to thereby cause substantially uniform sealing engagement of the outlet end with the sealing member.

Abstract: An elbow fitting for use in a pneumatic product conveying system expands from the inlet pipe along the outer side of the elbow fitting and contracts along the outer side of the fitting toward the outlet pipe for guiding product particles into the outlet pipe. The expanded structure of the elbow fitting defines a generally triangularly shaped configuration that provides a wide surface over which an accumulated layer of product particles moves at a lower velocity than the velocity of the incoming product stream. The accumulation layer of product forms a moving contact surface for deflecting incoming product particles toward the outlet pipe with a minimum of pressure resistance and product attrition. The configuration of the expanded elbow fitting provides a slowly moving layer of accumulated product particles due to the law of gravity and Bernoulli's Law.

Abstract: A coupling for joining pipe segments together is disclosed. The coupling is derived from a standard fitting and has a housing with a socket and a first expanded region adjacent to the socket and a second expanded region adjacent to the first expanded region. A sealing member is positioned in the first expanded region, a retainer is positioned in the second expanded region and a support washer having transversely oriented radial and coaxial flanges is positioned adjacent to the retainer. A lip turned inwardly on the second expanded region overlaps the radial flange and captures the support washer, retainer and sealing member within the coupling. The retainer has a plurality of radial teeth angularly oriented to engage a pipe and prevent its removal from the coupling.

Abstract: The present invention overcomes many of the disadvantages of prior art refrigeration line installation techniques by providing a line guide which, when properly mounted in the horizontal top plate of a structure, enables one person to properly install refrigeration lines. The line guide is adaptable to both wood and metal frame construction. In one embodiment, the line guide has a unitary body comprised of an attachment bracket with a guide tube formed therein. The guide tube's axial orientation changes over its length. The guide tube's change in axial orientation may be fixed or variable. In addition, the guide tube may be detachable from the bracket enabling guide tubes of different fixed orientations to be used in combination with the same bracket. In one embodiment, the line guide comprises a C-shaped bracket configured so as to be mounted in a notch formed in the horizontal top plate.

Abstract: An elbow comprising a body including an inlet having a inlet cross-sectional area is disclosed. The elbow includes a first section having a first end in communication with the inlet and a second end. The second end has a first cross-sectional area larger than the inlet cross-sectional area. A second section having first end and a second end is also included. The first end is in communication with the second end of the first section. The second end has a second cross-sectional area. The elbow includes a transitional section having a first end being in communication with the second end of the second section. The transitional section has an exit surface. An outlet is provided having a first end in communication with the exit surface and an second end through which the fluid exits.

Abstract: A connector clip integrally comprises a holder portion and a C-shaped clamp on one longitudinal end portion of the holder portion. The holder portion is mounted to a length from a connector to a curved portion of a pipe. The C-shaped clamp clips a tube connected to a tube connecting portion of the connector. The holder portion comprises a holding portion to hold a length from a tubular holder portion of the connector to an annular projection of the pipe therein, a first receiving portion formed on an opposite longitudinal side from the holding portion to receive a straight pipe portion of the pipe, and a second receiving portion formed on an opposite longitudinal side from the first receiving portion to receive a curved portion of the pipe.

Abstract: A dry sectional gate valve having a swiveling intake elbow and shot pin assembly for selectively locking the elbow into a fixed position. A shot pin extends from a pull-knob through the flange of the elbow into one of a plurality of spaced-apart detent slots or holes around the perimeter of the valve body. The elbow can be swiveled thereby allowing a connecting fire hose to be positioned to minimize kinks and avoid obstacles thereby bringing water freely into the valve. The shot pin can be used to selectively lock the elbow in a desired position facilitating connection and disconnection of mating fire hose couplings or the shot pin can be set to allow the elbow to rotate freely enabling the hose to reach its most relaxed position when charged.

Abstract: A tube joint comprises a joint body which is provided with an attachment/detachment mechanism for attaching/detaching a fluid tube and which is formed of a resin material, and a bellows section which has annular projections and annular recesses alternately formed to be continuous in an axial direction and which disperses external force (impact force) applied to an outer surface of the joint body to avoid any concentration of stress.

Abstract: A transition fitting for directing fluid from a first line into a second line includes a body, an inlet, an outlet, and a channel. The body defines a constant-volume channel that redirects a direction of the fluid entering the inlet. The inlet is connected to the body and connectable to the first line, and the inlet directs the fluid from the first line into the channel. The outlet is connected to the body and connectable to the second line, and the outlet directs the fluid from the channel into the second line. The bracket is connected to the body and at least partially surrounds the body.

Abstract: The invention relates generally to a solderless metallic-encased, polymeric-lined connector system and method for the fabrication of the same.

Abstract: An elbow comprising a body including an inlet having a inlet cross-sectional area is disclosed. The elbow includes a first section having a first end in communication with the inlet and a second end. The second end has a first cross-sectional area larger than the inlet cross-sectional area. A second section having first end and a second end is also included. The first end is in communication with the second end of the first section. The second end has a second cross-sectional area. The elbow includes a transitional section having a first end being in communication with the second end of the second section. The transitional section has an exit surface. An outlet is provided having a first end in communication with the exit surface and an second end through which the fluid exits.

Abstract: A stabilizer elbow lock that prevents a seal between a stabilizer elbow and a coupler valve from being broken by engaging at least a portion of the stabilizer elbow and by engaging at least a portion of the coupler valve. In an alternative embodiment, one or more adapters are provided that interface between the lock and the coupler valve and/or interface between the lock and the elbow.

Abstract: A joint device in a pipeline includes a connecting body, a joining screw nut, a connecting joint and two fixing coils. The connecting body has a connecting pipe with an end thereof being a connector and another end thereof being another connector. The first connector is provided with an annular recess and the second connector has at least two annular recesses. The joining screw nut at an end thereof is provided with internal threads and at another end thereof has a radial hole and is used for engaging with the first connector. The connecting joint at an end thereof has a radial hole corresponding to one of the annular recess on the second connector and extends outward a screw rod portion with a conical end. One of fixing coils is inserted into the annular recess on the first connector via the radial hole of the joining screw nut and the other fixing coil is inserted into one of the annular recesses on the second connector via the radial hole of the connecting joint.

Abstract: In a connecting structure of a pipe of an air conditioning unit and a pipe joint for supporting the pipe, an insertion hole through which the pipe is inserted is formed within the pipe joint. The insertion hole has substantially a L-shaped cross-section and includes a first portion for receiving an end portion of the pipe and a second portion for receiving a flat portion of the pipe. The second portion is elliptical-shaped. In connecting the pipe to the pipe joint, the pipe is pressed into the insertion hole by a pressing punch. As a result, the pipe is bent and shaped along the elliptical shape of the second portion in the pipe joint, thereby forming the flat portion in the bend of the pipe. At the same time that the flat portion is formed, the pipe is clamped in the pipe joint.

Abstract: A line guide for enabling a single person to complete the installation of refrigeration lines in a pre-built structure. The line guide is adaptable to both wood and metal frame construction. In one embodiment, the line guide has a unitary body comprised of an attachment bracket with a guide tube formed therein. The guide tube's axial orientation changes over its length. The guide tube's change in axial orientation may be fixed or variable. In addition, the guide tube may be detachable from the bracket enabling guide tubes of different fixed orientations to be used in combination with the same bracket. In another embodiment, the line guide is adapted for use in retrofit building applications. A guide tube is positioned through a hole formed in the soffit of the structure thereby allowing access to the overhead space. Annular bracket fittings help secure the guide tube in the soffit hole.

Abstract: A tube joint comprises a joint body which is provided with an attachment/detachment mechanism for attaching/detaching a fluid tube and which is formed of a resin material, and a bellows section which has annular projections and annular recesses alternately formed to be continuous in an axial direction and which disperses external force (impact force) applied to an outer surface of the joint body to avoid any concentration of stress.

Abstract: An apparatus and method to attach a sand tank discharge elbow to a valve in a sand classification tank using a removable spline and an optional hose clamp.

Abstract: A swivel drop ear elbow fitting includes a threaded nut, a retaining ring, and a hollow elbow adapter. The threaded nut includes a plurality of integrated attachment ears located along an external periphery of the threaded nut. An outer surface of the first portion of the elbow adapter is shaped to receive the retaining ring, which retains the threaded nut on the first portion of the elbow adapter, while allowing the hollow elbow adapter to rotate with respect to the threaded nut.