Merit Brass Chrome Plated Brass Pipe Fitting, Coupling, 1/2" National Pipe Taper Thread Female (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. Female National Pipe Taper (NPT) threads for connecting two male pipes Made from brass for higher corrosion resistance than steel Relative softness of metal enables tighter seals and greater ease in installation Manufactured to standards ASTM B-584, ANSI B 1.20.1, and ANSI B 16.15 for quality assurance