PEX Compression Fittings

Compression fittings for PEX operate in much the same way as compression fittings for copper or other plastic piping. The fittings consist of three parts: a compression nut, a compression ring, and a compression insert.

Making the connection involves placing the compression insert inside the end of the PEX tubing, sliding the compression ring over the tubing, then securing it with the compression nut. As it tightens, the compression nut presses the ring and the tubing against the insert, forming an absolute seal.

Compression fittings are easy to install and disassemble, making them popular among plumbers and contractors, as well as DIY homeowners. They are, however, more expensive than crimp fittings. Compression fittings are well suited when you are dealing with multiple connection points, or where disassembly is anticipated.