Brass Pipe Fitting, Class 125, Cap, 1/2" NPT Female These fittings contain lead and are not allowed by federal law to be installed for potable water use in the U.S.A. and its territories. Female National Pipe Taper (NPT) threads for fitting to male pipes or fittings Made from brass for machinability and higher corrosion resistance than steel NPT thread for compatibility with a range of threads More economical than steel