MaxLine 1" In-Line Ball Valve This is a Maxline Part Number M8040 - 1" in-line shut off ball valve for Rapidair MaxLine 1" tubing. This is a solid brass valve that is nickel plated to resist corrosion. This ball valve has a 175 PSI max working pressure and features a double o-ring sealed compression style fittings on each end specifically designed to be used only with the 1" MaxLine air system tubing. Specifications: Part no. M8040 1" in-line shutoff valve Solid brass Nickel plated 175 max constant working PSI Double o-ring sealed