Dallas Specialty Mity-Tite Push-fit Compression fittings are compatible with PEX, Copper, CPVC, PE-RT and SDR9 CTS HDPE piping systems. No tools required, easy push-fit design allows for easy installation. For repair and re-piping, farm & ranch plumbing systems, for hot and cold water lines. Designed for potable water systems and radiant heating systems (for underground or in the wall) applications. Meets ASSE/106 Std, ANSI/NSF-61 no.5550