PEXLock fittings work great with any brand or type of SDR-9 PEX or PE-RT tubing. Use with PEXLock plastic clamps which only require a simple pair of pliers to fix the connection. Rings and clamps are sold with the fittings unless specified in the description. Until now, connecting PEX and PE-RT pipe meant you needed special expensive tools. Flair-It has now developed a new type of clamp, called PEXLock, which will change and revolutionize the way of connecting PEX and PE-RT tubing. The new clamp is an invention protected for pending patents in the USA, Europe and Asian countries. PEXLock PSU insert PEX fittings meet cNSF-14pw and NSF-61 and are manufactured to ASTM Standards F877 and CSA 137.5 specifications and are ideal for professional installation of hot and cold potable water systems or do-it-yourself plumbing repairs. PEXLock fittings are constructed of durable Udel Polysulfone (PSU) resin. PSU is a superior plastic resin that is resistant to stress fractures and extreme temperatures. Keep all products made of PSU out of contact with VOCs.