Universal plastic plumbing joint

A flush to the surface mountable universal plumbing coupling joint adaptable for use as a cleanout opening, a drain assembly, a plastic to plastic or metal pipe adapter, and the like, comprising an integral plastic unit characterized by a barrel assembly having an outer cylindrical surface, a thin circular retainer flange extending circumferentially at a right angle from the outer cylindrical surface of said barrel assembly flush with one end thereof and being adapted to lie substantially flush on a plane mounting surface without danger of engaging a foot of a passerby and slightly protruding from said plane mounting surface, said cylindrical barrel assembly below said flange being extended below the floor surface, screw threads extending internally from the flange end along a major portion of the barrel assembly interior surface length, the threaded portion having a predetermined wall thickness for receiving a coaxially positioned screw threaded fitting mated thereinto, and a skirt portion on said barrel assembly extending from the end of the threads to the other end of said barrel assembly defined by a thinner wall thickness than said predetermined thickness, said outer cylindrical surface of said barrel assembly extending from said thin circular retainer flange to the end of said skirt portion at the other end of said barrel assembly and having a circumferential dimension for fitting its entire length inside the end of plastic pipes of standard size to permit solvent welding thereinto, and said skirt portion of said barrel assembly presenting an inner circumferential dimension to permit receipt of a pipe thereinto in an abutting fitting relationship against the end of the threaded wall portion.