Merit Brass X117-16 Brass Pipe Fitting, Class 125, Square Head Cored Plug, 1" NPT Male (Pack of 25) 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. Male National Pipe Taper (NPT) thread for a tight seal Made from brass for machinability NPT for compatibility with a variety of thread types Class 125 for applications with this requirement