Anvil 8700129359, Malleable Iron Pipe Fitting, Hex Bushing, 1" NPT Male x 3/4" NPT Female, Black Finish Hex bushing for connecting two pipes of different sizes Male National Pipe Taper (NPT) threads on the outside and female NPT threads on the inside Made from malleable iron for tensile strength and flexibility NPT threads for creating tighter seals than straight threads Black finish for corrosion resistance in oil and gas applications