PEX (cross linked polyethylene) pipe and fittings make plumbing easy and quick. Can be installed in three quicksteps. 1 - Cut and clean burrs on pipe. 2 - Insert pipe into fitting. 3 - Tighten collar and turn on water. It's that simple! Fittings can be used with PEX copper, PVC, CPVC or other CTS size pipes. Shut-off valve is rated for cold water only. Not for burial.