Initially, I just purchased online, but ordered the wrong part. I called and talked to a real person, who helped me order the correct part and offered a reasonably priced return shipping label. That was a welcome change from other recent online purchase interactions.
This is a M8039 3/4" in-line shut off ball valve for Rapidair Maxline 3/4" tubing. This is a solid brass valve that is nickel plated to resist corrosion. This ball valve has a 175 PSI max working pressure, features a double O-Ring sealed compression style fittings on each end specifically designed to be used only with the 3/4" Maxline air system tubing.
Specifications:
• Part Number: M8039
• 3/4"
• In-Line Shutoff Valve
• Solid Brass
• Nickel Plated
• 175 Max Constant Working PSI
• Double O-Ring Sealed