Lead Free Pipe Fitting, Square Head Solid Plug, 1/2" NPT Male Square head solid plug for closing and terminating the end of a pipe Male National Pipe Taper (NPT) threads for use with female 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 standards AE J476, ANSI B 1.20.3, FED-STD-H28/8, and C2745 for quality assurance