Libra Supply 1 x 1/2 inch(Nominal Size) Copper Reducing Female Adapter, C x FIP, (Click in for more size options), 1'' x 1/2'', 1 Copper x 1/2 FPT Copper Pressure Pipe Fitting Plumbing Supply For aboveground and belowground use Adapts to standard male pipe threads C x FIP connections Fitting ID Size: 1-1/8'' x 5/8'' (OD 1-1/4'' x 3/4''), Fitted Pipe ID Size: 1'' x 1/2'' (OD 1-1/8'' x 5/8'') Requires pressure to maintain water flow