Anvil 8700133757, Malleable Iron Pipe Fitting, Coupling, 1-1/2" NPT Female, Galvanized Finish Coupling for connecting two pipes going in the same direction Female National Pipe Taper (NPT) threads on both ends for connecting two male threaded pipes Made from malleable iron for tensile strength National Pipe Taper (NPT) threads for creating tighter seals than straight threads Galvanized finish resists rust in water, air, and steam applications