Coupling for concrete wall or floor mounting

A building construction which comprises:

• (a) an integral plastic coupling for plastic pipe and mounted in a cored or drilled hole in a concrete floor or wall defined by spaced apart planar surfaces which comprises a tube with opposed openings having spaced apart inner and outer cylindrical surfaces around a central longitudinal axis of the tube, wherein the inner surface has a first diameter equal to an outside diameter of standard plastic pipe and wherein the outer surface has a second diameter slightly smaller than a cored or drilled hole in the wall or floor to fit in an interference fit, a flange around one of the openings in the tube secured by an adhesive to one of the spaced apart planar surfaces of the floor or wall as a result of being press fitted into the hole with the adhesive as a bead at a junction between the outer cylindrical surface of the tube and the flange;
• and
• (b) plastic pipe mounted in the openings of the coupling and solvent welded to the inner surface of the coupling so as to form a continuous conduit with the coupling as part of the conduit.