Eaton Weatherhead 3152X8 Brass CA360 Fitting, Hex Head Plug, 1/2" NPT Male (Pack of 5) CA-360 brass for corrosion resistance, ductility at high temperatures, and low magnetic permeability Male National Pipe Taper (NPT) threads for creating tighter seals than straight threads Hexagonal head shape for increased leverage with a wrench Hex head plug for closing and terminating pipe ends Maximum working pressure of 1200 psi