Abstract: A multi-diameter plastic flange adapter that is fused to an end of a thermoplastic tube liner. The plastic liner and multi-diameter plastic flange adapter are inserted in a flanged pipe and air therebetween is evacuated thru a vent pipe.

Abstract: A means and apparatus for connecting resilient conduit is provided in which a first section of resilient tubing of internal dimensions sufficient to slide over the conduits and having two grooves, one spaced from each end of the internal surface of the section with each groove containing resilient gasket material substantially filling the groove to form a gasket around the conduit is slid into place so that the conduits to be connected are juxtaposed within the first section of tubing between the gasketed grooves. An encasing tubing is placed around said first section of tubing at least overlying the resilient gasket material. A pair of split metal clamping rings with one ring adjacent each end of the first tubular section and joined by a plurality of spacer bars united at each end to the clamping rings is fitted over the encasing tubing in relation to apply pressure on the encasing tubing when the split rings are united in clamped position.

Abstract: A means for adapting the end of a plastic pipe for coupling is provided in which the pipe is recessed circumferentially and the recessed area is further indented with three circumferential grooves. A first metal sleeve is shrink-fitted into the recessed area adjacent to the first groove furthest removed from the end of the pipe and further removed from the end of the pipe than this groove. A gasket ring of resilient material is inserted into a second groove which is between the first groove and the end of the pipe. A second metal sleeve having the same outside circumference as the third metal sleeve is shrink-fitted into the recessed area adjacent the first groove, encasing the gasket ring in the second groove, and indented into a first groove near the end of the pipe leaving a circumferential indentation spaced from the end of the pipe to receive one portion of a coupling device.