Air Chief Automotive Interchange Quick-Connect PlugsQuick-connect industrial interchange plugs work with many other makes. Couplers shut off automatically when disconnected for additional safety. Sturdy plugs are rated 300 PSI. Plugs function in a wide range of temperatures, from -40°F to 250°F. For air service use only. Interchanges with MIL Spec. MIL-C 4109F/A-A-59439. Body Material: Steel; Connection Type: Male/Female; Female Thread: 1/4 in (NPT); Male Quick: 1/4 in; Operating Pressure: 300.0 psi [Max]; Operating Temperature: -40 °F [Min], 250 °F [Max]; Weight: 0.01 lb.