Lead Free Brass Pipe Fitting, Union, Class 250, 1" NPT Female Union for connecting and extending two pipes Female National Pipe Taper (NPT) threads on both ends for connecting to male threaded pipes Made from lead-free brass for higher corrosion resistance than steel Relative softness of metal enables tighter seals and greater ease in installation Meets standard ASTM B-584-06 for lead-free quality assurance