Made of PPSU (polysulfone). Works on all brands of PEX tubing. Install with pliers, remove with a screwdriver. No special crimping tool required. Compatible with CNSF-14, CNSF-61, CSA. Fittings and rings included in each bag. Temperature ratings 180 deg. F to 100 psi, approved for behind-the-wall and underground applications. Patent pending. Black.