* 304 Stainless Steel Bolts. * 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 precise contact between ball and seats. * FKM (viton type) O ring stem seal. * PTFE self-lubricating stem bushings and seats cannot stick or bind. * Maximum operating pressure 100 P.S.I.