Anvil 8700135752, Malleable Iron Pipe Fitting, Reducer Coupling, 1-1/2" x 3/4" NPT Female, Galvanized Finish Reducer coupling for connecting two pipes of different sizes going in the same direction Female National Pipe Taper (NPT) threads on both ends for connecting two male threaded pipes of different sizes 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