Please Note -- It is 3/8'' Compression Fitting , Not 3/8'' NPT .
For use with Angle Shutoff Valve Outlet or Inlet Line in Bathroom , Kitchen, Dis-Washing Machine,etc .Typically used in Air , Water , Fuels, and Gas , Instrumentation and some Fluid systems.
Material : The Compression Cap was made Brass ,durable and corrosion resistance .