Information about plumbing with PEX tubing. How to connect PEX pipe, use PEX tools, make connections with PEX fittings..The widest selection of pex pipe under one banner anywhere. Pex A, Pex C, Pex Al Pex, and Multi layer C pipe for best features and price points.ProMix and ProLock .Enjoy a residential plumbing system that resists corrosion and saves money. Learn more about using PEX tubing and AquaPEX expansion fittings..Q What is PEX? A SharkBite PEX tubing is a cross linked polyethylene tubing that provides an excellent option for plumbing, radiant and hydronic systems in both .