Precision molded in polypropylene. Polypropylene is reinforced with fiberglass for additional strength. Self-aligning ball moves freely against the PTFE seats for smooth operation. The valve opens and closes with very little pressure on the handle. Ball is diamond turned after molding to make it spherically perfect, which provides the right contact between ball and seats. Viton "O" ring stem seal. Teflon self-lubricating stem bushings and seats cannot stick or rust. Stainless steel nuts and bolts are used to insure easy disassembly in corrosive conditions. Maximum operating pressure 100 P.S.I.