Use to bypass flow to water heaters and softeners. Made of PPSU (polysulfone). Works on all Brands of PEX pipe. Install with pliers remove with screwdriver. No special crimp tool needed. cNSF-14, cNSF-61, CSA compliant. Fittings and rings included in each bag. Temperature approvals 180 deg F at 100 psi approved for behind the wall and underground applications. Patent pending.