1" Ball Valve Female NPT; Full Port 4 Bolt . FKM (Viton® type) seals. Precision molded 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. PTFE self-lubricating stem bush­ings and seats cannot stick or bind. Stainless steel bolts.