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. However, it is susceptible to volatile organic compounds (VOCs) such as bug sprays, certain cleaners, pipe dopes, primers, glues and adhesives. Keep all products made of PSU out of contact with VOCs.