A collapsible conduit includes an elongated sheet configured as a coil, the coil having a longitudinal axis, the elongated sheet having a first edge that includes a first hem and a second edge opposite the first edge and that includes a second hem, each hem including an overlapping portion that overlaps with the overlapping portion of the other hem, the first hem interlocked with the second hem to form an interlocking arrangement between the first and second edges, wherein the conduit is collapsible along the longitudinal axis between fully extended and collapsed positions, and wherein the overlapping portion of the each hem has an arcuate cross-section shape when the conduit is in both the fully extended and collapsed positions.

A corrugated-tube protective member includes a tubular main body configured to be arranged inside of an end part of a corrugated tube with ridge portions disposed along its longitudinal direction, a rib on an outer circumference of the main body arranged inside the corrugated tube and configured to engage with the ridge portion in a removal direction of the main body from the corrugated tube, and a stopper at an end part of the main body having an outer diameter set to be equal to or larger than that of the ridge portion and configured to be arranged to oppose an end surface of the corrugated tube. An interval between the stopper and the rib is set to be equal to or larger than an interval between engaged surfaces on the ridge portions adjacent to each other, the engaged surface being a surface configured to engage with the rib.

Provided is a connection structure of a metal corrugated pipe, including: a first connection member including a first connection member inner guide straight pipe and a first connection member inner inclined pipe; the metal corrugated pipe inserted into the first connection member inner guide straight pipe and the first connection member inner inclined pipe of the first connection member; a second connection member fitted on an outer side of the metal corrugated pipe, and screw-coupled to the first connection member; a metal packing fitted on the outer side of the metal corrugated pipe, and inserted into the first connection member inner guide straight pipe and the first connection member inner inclined pipe so as to be pipe-reduced to form a curved surface; and a separation prevention ring configured to fix the metal packing to prevent the metal packing from being separated.

Provided is a corrugated pipe connection device. The device includes a corrugated pipe including a groove and a ridge that are successively and alternately formed, a nut into which one side portion of the corrugated pipe is inserted, wherein the nut has a screw-thread on an inner circumferential surface thereof, a clamping ring being formed in a ring shape cut at one place thereof and including an inner portion formed convexly in a radially inward direction of the corrugated pipe to be inserted into the groove of the corrugated pipe and an outer portion protruded in a radially outward direction from the inner portion, wherein the outer portion comprises an outer circumferential surface, and a socket having a screw-thread on an outer circumferential surface thereon onto which the nut is screwed.

A corrugated pipe connection device is completely coupled by primarily screwing a nut and a socket after interposing a clamping ring between the nut and the socket, inserting an one-side portion of a corrugated pipe, including a groove and a ridge that are successively and alternately formed, into the nut, and secondarily screwing the nut and the socket so that an inner portion of the clamping ring is inserted into the groove of the corrugated pipe and a distal end of the corrugated pipe is pressed. The corrugated pipe connection device is easily coupled in a simplified manner and is capable of achieving enhanced sealing efficiency.

A closure assembly includes a section of duct, a duct coupler assembly, a closure load plug, and an end cap. The duct coupler assembly is fit against the section of duct. The closure load plug is mechanically connected to the duct coupler assembly. The end cap is mechanically connected to the closure load plug.

A pressure hose (1) for a water-carrying system is shown and described, especially for connecting sanitary taps or for connecting parts of the water-carrying system, having a corrugated inner hose (2) made of plastic, wherein at least one hose end (3, 5) of the pressure hose (1) is provided with a connecting piece (4, 6), designed such that it differs from the inner hose (2), for joining the pressure hose (1) to a complementarily designed connecting piece of a sanitary tap and/or a part of the water-carrying system. According to the invention, it is provided that the inner hose (2) and the connecting piece (4, 6) are formed as one piece and the inner hose (2) and the connecting piece (4, 6) are preferably produced via extrusion in a common extrusion process.

A connector assembly (608) for a length of corrugated tubing (601) having an inner corrugated element (602) and an outer flexible sheath layer (603). The connector assembly (608) comprises a fitting (609) including a fluid-flow passage and an abutment surface (612) for the corrugated tubing (601) to seat thereon; axial loading means operably connectable to the fitting (609), the axial loading means including a connector (613) and a collet (610), the collet (610) having a radially inward protruding clamping element (611) for insertion into a trough (606) of the inner corrugated element (602), and a sheath-contact portion (625) for engaging the outer sheath layer (603), so that, when the connector (613) moves the collet (610) into engagement with the fitting (609), the collet (610) causes the corrugated element (602) to move onto the abutment surface (612) whilst maintaining engagement with the outer sheath layer (603). The sheath-contact portion (625) is axially positionable between the inner corrugated element (602) and the outer sheath layer (603) of the corrugated tubing (601), in use.

One aspect of the invention provides a method including: obtaining a kit as described herein; advancing a cut end of the length of CSST over the nipple of the fitting; placing the crimping jaw over the cut end of the length of CSST and the fitting such that: the one or more alignment bosses are seated within the one or more alignment grooves; the one or more crimping points are seated within one or more of the corrugation valleys; and the one or more crimping points and the corrugation valleys are radially over the one or more annular corrugation grooves; and applying force to the crimping jaws, thereby forming a gas-tight seal between the cut end of the CSST and the fitting.

A duct coupling system has a first concrete segment, a first duct positioned in the first concrete segment so as to have an end extending outwardly therefrom, a second concrete segment, a second duct positioned in the second concrete segment so as to have an end extending outwardly therefrom in a direction toward the end of the first duct, and a tubular member slidably positioned over the ends of the first and second ducts so as to join the first and second ducts together in a liquid-tight relationship. The first concrete segment is positioned in spaced relation to the second concrete segment. A wet joint is formed in the space between the first concrete segment and the second concrete segment. The tubular member is embedded in the wet joint.