Dixon DCP21S Stainless Steel 303 Air Chief Industrial Interchange Quick-Connect Hose Fitting, Plug, 1/4" Coupling x 1/4" NPT Male Air Chief industrial interchange quick connect plug for connecting directly to a hose with a male NPT end to connect with a female NPT threaded connection Air Chief industrial interchange quick connect plug with a male NPT threaded end Valveless construction allows flow when disconnected Stainless steel 303 for better machining characteristics than stainless steel 316 Interchanges with MIL-C-4109F/A-A-59439 specifications for quick-disconnect couplings for hoses and portable pneumatic tools, but not water or fluids, at maximum working pressures up to 232 psi (16 bar)