Anvil 8700130704, Steel Pipe Fitting, Hex Bushing, 3/4" NPT Male x 1/2" NPT Female, Galvanized 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 for creating tighter seals than straight threads Made from steel for greater rust resistance than iron Hexagonal head for increased leverage and use with a wrench during installation and disassembly Meets specifications ASTM A53 and ASME B 1.20.1 for quality assurance