Chrome Plated Brass Pipe Fitting, Locknut, 1/4" 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 use with male threaded pipes and fittings Made from brass for higher corrosion resistance than steel Relative softness of metal enables tighter seals and greater ease in installation Meets standards ASTM B-584, NSI B 1.20.1, and ANSI B 16.15 for quality assurance