U.S. Plastic Corp.® has a large selection of PVC pipe and fittings. PVC pipe which is made from polymerized vinyl chloride, a synthetic resin, which when plasticized or softened with other chemicals has some rubber-like properties. Derived from acetylene and anhydrous hydrochloric acid. Our PVC pipe has nominal sizes that are to be used with PVC socket fittings (schedule 40) and PVC socket or threaded fittings (schedule 80). All PVC socket fittings are designed to go on the outside of the pipe, not the inside. We carry most of the pipe and a wide variety of fittings in both white and gray.