Abstract: A double containment restraint pipe fitting of fiber reinforced plastic and centrifugally cast pipe comprising an outer containment housing and a coaxially positioned inner carrier housing having coaxially positioned segment of containment pipe and carrier pipe adhesively bonded at each opening of the fitting and a rigid centering ring adhesively bonded to each pipe segment and occupying the annular space therebetween at each opening of the fitting. A make-up fitting for adhesively closing the exterior confinement pipe during installation, assembly and/or repair is also provided.

Abstract: A coupling between an end of a fluid conducting tube and a socket in a housing at the end of a fluid conducting passage in the housing. An annular shoulder on the tube seats on an annular base of the socket in an installed position of the tube and a annulus is defined between the outside of the tube and a circular entry to the socket above the base. A tubular plastic retainer, slidably disposed on the tube behind the annular shoulder and outside the socket, has an outwardly flared front end section which is squeezed to the smaller diameter of the circular entry and pushed into the annulus between the entry and the tube. In a seated position of the retainer, the flared front end section radially overlaps the annular shoulder so that a shear section of the retainer is defined between the annular shoulder and the circular entry. The shear section resists withdrawal of the tube from the socket.