Parker Brass Pipe Fitting, Hex Head Plug, 1/2" NPT Male Hex head plug for closing and terminating pipe ends Hexagonal head shape for increased leverage and use with a wrench Male National Pipe Taper (NPT) threads for creating tighter seals than straight threads Made from brass, for machinability and higher corrosion resistance than steel Meets standards ANSI B31.1 and B1.20.1 for quality assurance