Anvil 8700129003, Steel Pipe Fitting, Hex Bushing, 1/2" NPT Male x 1/4" 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 steel for greater rust resistance than iron NPT threads for creating tighter seals than straight threads Meets specifications ASTM A53 and ASME B 1.20.1 for quality assurance