Dixon Valve DCP17 Steel Air Chief Industrial Interchange Air Fitting, Quick-Connect Plug, 1/2" Coupling x 1/2" NPT Male Thread, 150 CFM Flow Rating Quick-connect coupler plug for shut-off when disconnected from a coupler socket Steel for strength and resistance to corrosion 1/2" male NPT connection for connecting to a hose fitting and a 1/4" coupler connection Maximum pressure rating of 300 psi Temperature range of -40 to +250 degrees F