PEX (cross linked polyethylene) pipe and fittings make plumbing easy and quick. Can be installed in three quick steps. 1 - Cut and clean burrs on pipe. 2 - Insert pipe into fitting. 3 - Tighten collar and turn on water. It's that simple! Push-fit system suitable for the plumbing of normal domestic hot and cold water services; including pressurized and combo systems. Fittings have been designed for use with Copper Pipe, Speedfit® PEX Pipe, CPVC and other PEX Pipe conforming to US Plumbing Standards. Not for burial. Not for use with gas, fuel oil or compressed air applications. Not listed with IAPMO.