What is the outside diameter of the fitting?
Since most fittings are made to go onto pipe. The inside dimensions of the socket are held to close tolerances. However, the outside diameters DO NOT have industry controls. The manufacturer makes the part with a MINIMUM wall thickness as specified by ASTM standards working outward from the interface diameter of the socket or pipe. The outside surface, and configuration of the fitting typically varies by brands, and sometimes within a brand, and does not affect fit not function.
