Abstract: Interconnecting short plastic pipe segments, with at least one stub shaft molded onto each pipe segment. A polymer selected from one of the polyolefins, such as polypropylene, is the preferred plastic because of its resistance to chemical erosion and because polypropylene, unlike some other plastics, such as polyvinylchlorides, can be recycled. The pipe segments can be economically molded in segments of about one foot in length, and are rigidly held together by novel load-bearing clamps.

Abstract: A strengthened pipe fitting for connecting to an externally threaded surface and a method for making a strengthened pipe fitting for connecting to an externally threaded surface is provided. The strengthened pipe fitting comprises a pipe fitting having an internally threaded surface initiating from the attachment end and a compression band fitted onto the attachment end of the pipe fitting. The pipe fitting is initially manufactured, in absence of the compression band, to have an internally threaded surface with a pitch diameter larger than that specified for mating with the externally threaded surface. The compression band is then fitted onto the attachment end of the pipe fitting. The compression band is uniquely sized to compress the internally threaded surface sufficiently so that the internally threaded surface of the strengthened pipe fitting mates with the externally threaded member.

Abstract: A quick connect coupling for tubing. The coupling includes a tubular male connector member adapted to be telescopically received within a tubular female connector member assembly. The female assembly includes a first member defining a seal bore and a cylindrical socket portion forwardly of the seal bore. A second female member includes a cylindrical portion which plugs into the socket of the first member and is held in position relative to the first member by sonic welding. A plurality of circumferentially spaced feet on the inner end of the second member are positioned proximate the seal to hold the seal in the seal bore and further engage the outer periphery of the pilot portion of the male member to minimize cocking of the male member relative to the female assembly.

Abstract: A resin hose connecting structure includes a resin hose including a hose body and a connecting portion formed coaxially and integrally with an end portion of the hose body and having an inserting inner peripheral surface, and a mating member made of structural material having a tubular inserting end portion for inserting into the connecting portion of the resin hose. The tubular inserting end portion includes a ring-shaped contacting surface and an inserting outer peripheral surface. In the hose body, at least the end portion is made of hard thermoplastic resin and is molded by a blow molding method. The connecting portion is made of soft thermoplastic resin and is molded by an injection molding method.

Abstract: A fiberglass pipe joint with threaded ends has rough surface areas adjacent to such ends which allow strap wrenches to be used to tighten the threads with a high torque that prevents leakage. The rough areas are formed by partially embedded sand grains which are sprinkled on the resin component prior to curing, or on a wet bonding material after curing.

Abstract: An apparatus which creates a pre-engineered solvent bond is disclosed which allows the bond characteristics of the resultant solvent bond to be predetermined. These characteristics can thus be chosen by the part designer with confidence that inherent variations in the assembly process will not unduly impact the resultant bond. The design establishes a specific volume through removable shims. Solvent added to this volume acts to dissolve material so that the predetermined bond characteristics are created.

Abstract: The present electrical conduit coupling includes an electrical conduit coupling 10 and a lubrication fitting 11 thereon. The coupling includes a hollow body 12 including an external surface 13 and an internal surface 14. The internal surface defines a central bore 15 extending between first and second open ends 17, 19 that are adapted to receive conduit ends. A thickness dimension exists through the hollow body between the internal and exterior surfaces 13, 14. The lubrication fitting 11 is provided on the hollow body 12 between the first and second ends 17, 19. The fitting 11 extends at least partially through the thickness dimension to communicate with the central bore 15. The lubrication fitting 11 includes an internal one way valve 31 that permits injection of a lubricant into the central bore 15 but automatically closes to prevent reverse flow of lubricant outwardly through the fitting 11.

Abstract: A fluid connector assembly having a spacer for positioning at least two quick connect conduit members in a predetermined position with respect to one another in order to reduce assembly time and ease serviceability. The spacer provides at least two means for receiving the conduit members wherein each of the receiving means has a longitudinal axis that is substantially parallel with respect to one another. The spacer also provides a rigid connecting means to connect the receiving means and insure that the longitudinal axis of the receiving means are substantially parallel as well as having the receiving means radially spaced and axially offset from one another. By having the receiving means the same length and having the receiving means axially offset, the spacer insures that the tubular conduit members can only be assembled to a heater core in a proper orientation. The conduit members provide a quick connect means for rotatably and releasably retaining the tubular member within the conduit members.

Abstract: A composite fabric structure comprising a plurality of warp and fill fibers or yarns forming a fabric substrate which is impregnated with a matrix material which contains a plurality of cells which impart compressibility to the fabric substrate. This fabric may be used, for example, in a composite structure for use with one or more additional layers or coatings. Articles which may be formed from the composite structure include gaskets, packing materials, flexible diaphragms or printing blankets. In the printing blankets, one or more of a vulcanized rubber layer, a fabric layer and a compressible layer may be included.

Abstract: A force-transmitting joint formed between two pipe sections is provided that is particularly suited for an extruded, plastic pipe having a variable wall thickness. The joint has a smooth outer surface and a constant gap in which a sealing member is retained. The pipe section has an outer wall including an outer surface and an inner surface with a variable wall thickness defined therebetween. A first end of the pipe section includes a first joint member comprising a first support surface having a constant width. The first joint member further comprises an outwardly extending sealing leg having a variable width. A second end of the pipe includes a second joint member comprising a second support surface having a constant width which is less than the width of the first support surface. The second joint member further comprises a recess having a variable thickness. An annular sealing member is assembled onto the sealing leg.

Abstract: A resuscitator apparatus including a resilient, self-inflating squeeze bag having a single combined inlet/outlet which is preferably removably connected to a first manifold in operative communication with a substantially unbiased valve device. The first manifold includes an inlet coupling adapted for connection to a source of pressurized respiratory gas such as oxygen and an outlet coupling adapted for connection to a first end of a tubular connector. The tubular connector is desirably formed as a short, kink-resistant, flexible hinge member. The second end of the tubular connector is adapted for swiveled connection to an inlet coupling of a second manifold in operative communication with a non-rebreathing valve contained within a tubular, preferably L-shaped housing.

Abstract: A quick connect coupling is disclosed having a plastic housing with a first end, a second end and a throughbore extending between the ends of the housing. The housing also includes a radially inwardly extending abutment surface integrally formed with the housing around at least a portion of its first end. A fluid conduit defining a fluid passageway and open at one end is insertable into the first end of the housing so that the fluid passageway in the conduit registers with the housing throughbore. The fluid conduit also includes a radially outwardly extending bead formed circumferentially around the conduit at a position spaced from the open end of the conduit. Upon insertion of the conduit into the female housing, a metal retainer contained within the housing lockingly engages the conduit bead in order to secure the conduit and housing together. Fluid seals in the housing seal the housing and conduit together thus completing the fluid connection.

Abstract: A protective collar for hose connections consists of a hard clamping ring or collar comprised of two semicircular segments in the shape of a disk, the segments mating together. The center opening of the disk clamps onto the ferrules of one or both connecting hoses. The segments are held together by screws or bolts and nuts which pass through internal bores in the segments. The protective collar is of a greater outside diameter than the ferrules so that the protector, And not the ferrules, will absorb any impact from being stepped on, dropped on the floor, or pinned beneath a heavy object.

Abstract: A pipe joint for fiber reinforced composite pipe has internal and external matching tapers with a low taper angle. A half round helical groove is formed in each of the internal and external tapers for receiving several turns of a ductile key. Deformation of the key in shear redistributes longitudinal loads along the length of the pipe joint. The outer member of the pipe joint has a high stiffness so that internal pressure in the pipe presses the tapered surfaces together so that the resulting friction enhances the longitudinal load carrying capability of the joint. High external stiffness may be provided by winding the external moiety of the joint with high modulus of elasticity fiber. The pipe joint is sealed by introducing a liquid ductile thermosetting sealant between O-rings at the inner end of the joint. The seal can be nondestructively tested and deployed under water before the sealant cures.

Abstract: An annular seal for use in a heat exchanger connection comprising a tube and at least one annular seal, wherein the annular seal is compression seated upon the outside diameter of the tube.

Abstract: A screw thread for thin-walled tubing tubing having an outside diameter and a wall thickness less than about one twenty-sixth said diameter, said thread having a depth less than half said wall thickness, a pressure angle below 10.degree., and a thread pitch at least ten times the thread depth.

Abstract: A branched hose connector includes a branched inner pipe substantially made from a suitable lightweight material, a plurality of hoses connected onto the branched inner pipe, a cover covering the branched inner pipe and a portion of the hoses to join the branched inner pipe and the hoses, and an integrally formed flange projecting outwardly. The branched hose connector is lightweight so that it can be installed with ease via the flange, and it can be manufactured easily and less expensively. Further, the branched hose connector can include a valve member, and a convexity and a concavity provided on opposing end surfaces of the branched inner pipe and the valve member. With these extra features, the valve member can be tightened into the branched inner pipe with a predetermined appropriate torque by a manual operation alone, and it can resist loosening by vibrations, or the like.

Abstract: A secondary containment piping system is composed of a plurality of modules of concentric pipe. The inner pipe carries fluid being transported, and the outer pipe provides secondary containment of fluid leaking from the inner pipe. The module consists of a length of inner pipe centred in a length of outer pipe by a series of spiders or ribs, fastened to one or both of the pipes. The ends of both inner and outer pipes are coplanar and perpendicular to the axis of the module. Successive modules are joined by simultaneously welding the inner and outer pipes of one module to the corresponding pipes of an adjacent module, the preferred material for the pipes is HDPE and the welding is accomplished using electric fusion welding techniques.

Abstract: A safety shield for capturing corrosive fluids escaping from joints or valves in piping systems consists of first and second shroud members releasably joined together to form an enclosed chamber in assembled position about the joint or valve. The chamber includes at least one aperture which is sized and shaped for mating engagement around the pipe. Corrosion resistant gasket members interposed between the first and second shroud members and between the pipe and the at least one aperture render the enclosed chamber vapor tight in the assembled position. The chamber may further include at least one other aperture sized and shaped to receive the operating stem of the valve therethrough, and a corrosion resistant gasket interposed between the valve stem and the at least one other aperture for forming a vapor tight seal without interfering with the operation of the valve.

Abstract: An improved flowing arch expansion joint includes a fiberglass body layer having an overlapping longitudinal seam that are bonded together by a layer of heat flowable fluoropolymer material. The radial expansion strength of the joint is enhanced by a supplemental peripheral reinforcing strip extending over less than the entire axial length of the joint, in the area of the maximum diameter portion, only. The peripheral reinforcing strip is formed by a winding process in which tire cord-based strip material is wound at a laying angle as close as possible to ninety degrees relative to the axis of the joint.

Abstract: An improved axially split clamp for preventing rupture of the O-ring seal of Ford Spring-Lok fittings even when the outside diameter of the Spring-Lok fitting is oversized. Each mirror-image half of the axially split clamp includes a semi-annular surface sized to fit snugly over the cage of the Spring-Lok pipe and also a semi-circular surface positioned to encircle that portion of the Spring-Lok push-on fitting over the coupling's O-ring seal. A flat-sided groove is cut in each semi-circular surface and a ribbon-like strip of rubber or other resilient material is inserted into the groove. The strip's thickness is about twice the depth of the groove so that when the two halves of the clamp are screwed together, the resilient material will firmly grip the outer diameter of the push-on fitting and thereby prevent back and forth transverse movement of the Spring-Lok fitting, prevent wear and failure of the O-ring seal and prevent the escape of fluid from the Spring-Lok coupling.

Abstract: Thermo-weldable coupling for connecting in particular at least two members made from an identical or compatible plastics material, comprising a body (1) which is of the type constituted at least partly by a thermo-fusible material compatible with the plastics material of these members and which comprises an inner wall (2) or connection surface, directly opposite the outer wall of the members, provided with an electrically conducting element (3). This electrically conducting element (3) is resilient and of non-rectilinear shape. Application to the connections of fluid-carrying pipes made from plastics material.

Abstract: A coupling assembly for hoses fabricated of plastic and comprising one-piece male and multi-piece snap together female coupling section. The male section includes an externally threaded fitting and an integral hub adapted to fit over the end of a hose section, the hub having integrally formed ribs or barbs. A ferrule inserted into the hose expands the base all into engagement with the ribs or barbs for securing the section to the hose. The female section includes an annular collar fitted over and secured to the end of a hose section. An annular flange terminating in a forwardly axially extending annular sealing lip is formed on the collar and an internally threaded connector is provided including an inwardly extending annular flange adapted to snap over and engage behind the flange for rotatably mounting the connector on the collar.

Abstract: Assembly is described for providing a radial seal between two air conduit members. The assembly generally comprises a first conduit member having seal retainer thereon and, second conduit member having a tubular section which is inserted into the seal retainer, during formation of the radial seal. The seal retainer comprises a retainer trough having a removable and replaceable seal ring positioned therein.

Abstract: A plastic coupling for plastic tubing having a groove annulus formed between a first circumferential groove on the outer periphery of the enlarged diameter portion of a connection tube and a second circumferential groove on the inner periphery of a cap nut 5 when the cap nut 5 is mounted on a joint body, and an enlargeable split ring having an internal diameter smaller than the external diameter of the enlarged diameter portion and loosely fitted into the second groove, the split ring being adapted to slide on the enlarged diameter portion to the first groove until the split ring falls within the first groove and is located within the groove annulus when the cap nut is mounted on the joint body.

Abstract: A squeeze-to-release quick connector for engaging a flanged male member includes a cylindrical body portion which is open at one end for receiving the male member and forms a conduit receiving adapter at its opposite end. An annular retainer ring is axially spaced from the open end and is attached to the body portion by two circumferentially opposed, generally parallel axially elongated beam members. Each beam member is affixed at one end to the retaining ring and at an opposed end to a mount located on the body portion axially spaced from the open end. Two circumferentially spaced detents extend inwardly from a retaining ring to capture the male abutment surface to effect positive engagement therebetween. The opposed ends of the beam members extends axially beyond an abutment surface of the detents and is spaced from the detents. A finger is formed on each detent extending axially from the abutment surface of the detent toward the open end of the body portion and is spaced from the adjacent beam member.

Abstract: A quick connect coupling for tubing. The coupling includes a tubular male connector member adapted to be telescopically received within a tubular female connector member. The female connector member includes a tubular housing and a tubular retainer cap which is permanently bonded to the housing utilizing a sonic welding technique and which defines prong portions for latching coaction with an annular bead on the male member. The coupling further includes a unitary elastomeric seal positioned in a bore of the female member housing and defining a series of axially spaced, radially inwardly extending seal ribs slidably and sealingly engaging the outer circumferential surface of the male connector member.

Abstract: An apparatus which creates a pre-engineered solvent bond is disclosed which acts to self-optimize the characteristics of the resultant solvent bond. These characteristics can thus be chosen by the part designer with confidence that inherent variations in the assembly process will not unduly impact the resultant bond. The design establishes a specific volume through integral tabs or removable shims within which solvent acts to precisely dissolve material so that the predetermined bond characteristics are automatically created without reliance upon assembler technique.

Abstract: A tube-type coupling or clamping joint is formed of plastic and comprises two cylindrical cartridge-shaped body portions 2, 3 having end regions 8, 9 which interfittingly overlap and mate with each other in a detachably connected manner. At least one locking part 10 is arranged for joining the elements 2, 3. One end region of one of the cartridge-shaped elements carries at its outer circumference at least two stop elements 11, 11' which extend at right angles to the longitudinal axis L--L. Axially behind the stops 11, 11' there is arranged to be inserted as a portion of the locking part 10 a stop arm 12, 12' that can rotate at right angles vis-a-vis the longitudinal axis of the coupling. Located in the other end region 9 of the mating cartridge-shaped element is a resilient ring element 14 and a locating flange 16.

Abstract: A molded hose branch of rubber includes an assembly formed by slipping completely vulcanized rubber hose lengths with ends onto free ends of a plastic tubing branching piece. The assembly is placed into a mold, and a thermoplastic material, for instance a blended mixture of polypropylene and EPDM, is injection molded around the assembly so as to join the thermoplastic material to the rubber hose lengths. This results in a sleeve around the rubber hose lengths and free parts of the tubing branching piece between the ends of the rubber hose lengths.

Abstract: A welded joint for a thermoplastic double containment pipes is formed by an apparatus including an electrofusion welding sleeve placed over the primary pipe, an electrofusion welding sleeve placed over the secondary pipe, clamps which concentrate their clamping pressure at preselected areas on the secondary pipe sleeve and anchor plates located on one or both opposite sides of the joint.

Abstract: A pipe fitting or coupling is used for connecting at least two pipes. The pipe fitting is basically formed of a coupling main body and a slit ring integrally formed together. The coupling main body is formed of an inner layer of good heat resisting property, an intermediate layer containing glass fibers, and an outer layer having large tensile elongation and impact strength. The slit ring is formed at an edge portion of the outer circumferential surface of the coupling main body.

Abstract: Lengths of ribbed tube (10) having ribs which upstand appreciably from the main body of the tube may be coupled together using novel coupling ends (12, 112 and 14, 114, 214) of the tube. Alternatively, such ribbed tube may be coupled to plain walled tube (100). The lengths of tube are provided with first and second cuffed ends, the first end being a smooth walled cuff having a cuff having only shallow ribs reduced height and the second end being belled to couple with a first end of another tube or with plain walled tube smooth first end and the billed second end may be formed to respective outer and inner diameters for good sealing between them.

Abstract: The radially deformable pipe of the invention is made up of at least two sections releaseably coupled end to end. The end of one of the sections has, over a predetermined axial length, an internal perimeter substantially equal to the external perimeter of the end of the other section, so as to form a male end adapted to be inserted in a female end. The extreme margin of the male end includes a locking bead adapted to fit in sealed manner in an internal groove of the female end behind a locking bead including the edge of this groove (9). The extreme margin of the female end is fitted into an external groove of the male end spaced from the locking bead by the said axial length.

Abstract: A length of corrugated tubing is (B) inserted into a bell (C) having an open end 42. The corrugated tubing is defined by alternating annular portions peak (22) and valley portions (24) and a cylindrical inner wall (26) connected with an inner surface of the valley portions. Annular chambers (28) are defined between the cylindrical inner liner and each peak portion. The bell has a stop (10) and a cylindrical side wall (40) with a groove (44) for receiving a gasket (30) that is disposed in one of the tubing valleys. The groove is constructed an integer number of peak and valley portions from the stop such that the gasket aligns with the groove when an end of the tubing length abuts the stop. A plurality of latch elements (60) are disposed an integer number of peak and valley portions from the gasket receiving groove toward the bell open end. The latch elements extend into another of the valley portions and engage a corrugation side wall to transfer axial uncoupling forced from the tubing to the bell side wall.

Abstract: A coupler for joining a polymeric elongate substrate to another substrate, comprising:(1) a tubular element containing an aperture; and(2) a penetrating member which is secured to the tubular element and which can move from a rest position to a working position wherein, in the working position, a portion of the penetrating member passes through the aperture and penetrates the surface of the elongate substrate.

Abstract: A clip for providing end to end connection between a rigid and a flexible hydraulic pipe comprises a base by which it may be attached to a workpiece, a frame portion extending upwardly from the base having a circular bore, which can receive a rigid pipe as a force fit, and a hexagonal bore which may receive a flexible pipe and hold it against twisting and clamp means on the base to embrace the flexible pipe and hold it in position.

Abstract: A containment pipe fitting subassembly of a containment fitting, having open end sockets of a radius to slidingly receive ends of containment pipes, a carrier fitting having open end sockets of a radius to slidingly receive ends of carrier pipes, the carrier fitting being inside the containment fitting, a pair of alignment supports between respective ones of the containment fitting sockets and the carrier fitting sockets, each support having a peripheral flange with a radius comparable in size to the radius of said containment fitting socket and fitted therewithin, the flange defining a central orifice having a diameter comparable in size to the inner diameter of the carrier fitting socket, and each support also having an axially extending cylindrical sleeve with an inner diameter comparable in size to the outer diameter of the carrier socket and fitted over and adhesively tacked to the carrier socket. Carrier pipes are inserted into and bonded to the carrier fitting sockets.

Abstract: A method of joining conduits includes using a coupler, which includes a pliable tubing and a pair of end sleeves. The coupler is attached to the ends of a pair of conduits by flexing the tubing to cause the coupler to flex into proper alignment and connection with the conduits.

Abstract: A flexible joint for an exhaust pipe of a motor vehicle which includes: a cylindrical inner layer which consists of a cloth made of ceramic fibers, the inner layer being expansible in an axial direction thereof; an intermediate layer formed of a heat insulating material, for covering an outer circumferential surface of the inner layer; and a cylindrical outer layer disposed radially outwardly of the intermediate layer and formed of an elastic material.

Abstract: A resin-made detachable fitting to which a tube is connected. The fitting comprises a core of a cylindrical or ring shape forcibly inserted into the tube end to expand it, a fitting body having an inner passage, and a box nut able to mesh with ends of the fitting body and connecting the tube end to the fitting body. The fitting body comprises a cylindrical socket portion axially cylindrically extending from the fitting body ends and having an outer diameter equal to the inner diameter of the core. The socket portion has a sealing surface at its end. The fitting body further comprises a cylindrical securing portion axially extending from the fitting body ends and formed coaxially around the socket portion to form an insertions space. The securing portion has a securing wall facing the socket portion and holding, together with the socket portion, the tube inserted into the insertion space. The box nut comprises a holding surface facing the sealing surface.

Abstract: A threaded tubular connection is depicted (120) for connecting joints of reinforced thermosetting resin pipe. Box threads are formed in both ends the joints as at (107) for connection by means of a coupling (102) formed with pin threads (104) on both ends. The coupling is formed of a material having a more reliable compressive strength than the pipe material, to prevent cracking and shattering of the pipe material upon make-up. A process for forming threads with the pipe joints is disclosed.

Abstract: A flexible pipe connector is disclosed for connecting to a hard plastic pipe. The flexible pipe connector, preferably made of polyethylene, has a tubing member which defines a cylindrical wall with inner and outer surfaces, the cylindrical wall having a male end which has a plurality of undercuts formed on the outer surface. The male end with the undercuts is inserted into the female end of a hard plastic pipe with a melting agent applied at the inner surface thereof. The melting agent melts the inner surface of the pipe's female end to form a liquified layer of hard plastic which is received in the male end's undercuts and then hardens into a reconfigured solid layer. In this manner, the flexible pipe connector, which is inert and normally cannot be attached with glue to a hard plastic pipe, can be sealably secured to a hard plastic pipe as the liquified layer solidifies within the undercuts to prevent separation of the pipe connector and the hard plastic pipe and to provide a seal therebetween.

Abstract: An improved connecting device for of securing a pipe fitting of one material to a pipe of another. This invention provides a connector body with an insert fitting which does not leak therebetween. Further, the invented device has an integral annular flange, which extends into the surrounding body thereby preventing the body from expanding with heat and slipping with relation to the insert upon engaging the fitting with a nipple or other pipe material, and twisting forcefully.

Abstract: A pipe joint for first and second profile wall pipes of the type having generally concentric, spaced apart inner and outer walls, and a helical rib connecting the inner wall to the outer wall. The convolutions of the helical rib extend in multiple turns around the exterior of the inner wall and along the interior of the outer wall for substantially the entire length of the pipe. The pipe joint includes a first exposed portion of the rib of the first pipe, and a second exposed portion of the rib of the second pipe. The exposed helical rib of the first pipe is threadably interengaged with the exposed helical rib of the second pipe.

Abstract: A split connector for joining pipe elements insitu including a first pipe element and a second pipe element positioned in a structure, a pair of matched semi circular body elements of semicircular construction adapted for forming a generally circular coupling connector having a cylindrical body and including an internal facing surface divided at the mid point, the first half adapted to engage a tubular end of the first pipe element and the second half adapted to engage the second pipe element, having wedge, members for connecting the first body element to the second body element and a pair of female grooves on the second half cylinder for forming a unitary axially-split collar having water tight seams; and including an internal shoulder capable of engaging a lug the first pipe section with fastening provided by adhesive applied to the pipe ends and the facing surfaces of the split connectors for providing a watertight seal and structural strength of the piping components; wherein the pair of matched semi circ

Abstract: A method for manufacturing a filament reinforced plastic pipe including an integral bell, the method comprising the steps of winding a filament bundle, in a plurality of layers, around a mandrel having a cylindrical outer surface to form a pipe including a bell portion having a cylindrical inner surface, and machining the inner surface so that the inner surface is tapered.

Abstract: A method of attaching first and second lengths of fiberglass reinforced plastic pipe, the method comprising the steps of winding the first length of pipe around a metal female member, threading a metal male member onto an end of the second length of pipe, and threading the male member into the female member.

Abstract: A fitting or connecting corrugated tubing has a through opening and a liquid tight corrugated tubing connecting portion. The connecting portion has a shank to receive the corrugated tubing and a collar of greater diameter than the shank. The collar extends along the shank from a shoulder in the fitting and terminates before the end of the shank. Pawls in the connecting portion extend from the shank between the collar and the end of the shank. The pawls are hinged and have bevels and a bearing surface. The collar on the shank has an outside diameter slightly greater than the inside diameter of the corrugated tubing which renders the connector liquid tight when engaged with the corrugated tubing. The pawls resiliently extend to engage themselves in an inner corrugation of the corrugated tubing. Various pawl configurations engage the inside corrugations of corrugated tubing for a quick and firm liquid tight connection.

Abstract: A plumbing and heating pipe system for water supply purposes, made either completely or mainly of plastic material, especially of polypropylene, said system being provided with metallic connecting sleeves as well as reducers for connecting the plastic pipes to fittings of metallic materials, and being provided with shut-off valves made of plastic material and having a plastic-encased metallic valve seat for mounting in pipe lines, and being provided with pressure-type screw connections for the pipes to be joined to each other and with reducers for connection to radiators, wherein a welding device having an arrangement for equalizing the lengths of the plastic pipes is used to weld parallel plastic pipes.