Banjo Ball Valve 4" Full Port 8 Bolt 4" Female NPT, Full Port, 100 psi @ 70?F Bolted Ball Valve features: Stainless Steel Bolt Precision molded in polypropylene. Polypropylene is reinforced with fiberglass for added strength. Self-aligning ball moves freely against the Teflon seats for smooth operation. The valve opens and closes with little pressure on the handle. Ball is diamond turned, after molding, to make it spherically perfect,which provides accurate contact between ball and seats. Viton "O" rings. Teflon self-lubricating stem bushings and seats cannot stick or bind.