Ball is diamond turned, after molding, to make it spherically perfect, which provides precise contact between ball and seats. FKM seals. Maximum operating pressure 225 PSI. Precision molded in polypropylene. Polypro­py­lene is reinforced with fiber­glass for additional strength. PTFE self-lubricating stem bushings and seats cannot stick or bind. Self-aligning ball moves freely against the PTFE seats for smooth operation. Stainless steel bolts. The valve opens and closes with very little pressure on the handle.