Anvil 8700132650, Malleable Iron Pipe Fitting, Cap, 1/2" NPT Female, Galvanized Finish Cap for closing and terminating the end of a pipe or fitting Female National Pipe Taper (NPT) threads for connecting to a male pipe or fitting Made from malleable iron for tensile strength National Pipe Taper (NPT) threads for creating a tighter seal than straight threads Galvanized finish resists rust in water, air, and steam applications