The Sharkbite check valve is a general-purpose, spring-loaded check valve that can be installed in seconds on copper, CTS CPVC, and PEX. It can be installed horizontally or vertically and prevents the reverse flow of water through the water supply line in domestic water supply systems. The Shartbite push-fit fittings have been designed certified and listed to ASSE 1061/NSF 61. They are listed and certified by IAPMO. The fittings have also been certified for underground applications and as a manufactured joint without access panels. They meet UPC, IPC, and Canadian plumbing code requirements. Product is individually bagged. manufactured to include no more than 0.25% weighted average lead content on wetted surfaces.