CPVC fittings different than PEX fittings

CPVC and PEX systems use different types of fittings. CPVC fittings are socket fittings, in which the pipe is inserted into the fitting. PEX fittings are insert fittings, in which the fitting goes into the pipe so that the pipe surrounds the fitting, reducing the internal diameter of the pipe at each fitting.

The fittings are also joined to the pipe using different methods. CPVC fittings are solvent welded to the pipe, creating a permanent bond that renders the pipe and fitting one continuous piece of CPVC. PEX fittings are mechanical in nature. Depending on the type used, the fitting is connected to the pipe through one of three methods: crimp, clamp, or cold expansion. PEX fittings also require rings in addition to the insert, whereas CPVC fittings are all one piece.