Dixon Valve DCP21 Steel Air Chief Industrial Interchange Air Fitting, Quick-Connect Plug, 1/4" Coupling x 1/4" NPT Male Thread, 37 CFM Flow Rating Quick-connect coupler plug for shut-off when disconnected from a coupler socket Steel for strength and resistance to corrosion 1/4" male NPT connection for connecting to a hose and 1/4" coupler connection Maximum pressure rating of 300 psi Temperature range of -40 to +250 degrees F