Libra Supply 1 inch(Nominal Size) Copper Pressure Coupling No Stop C x C, (click in for more size options), 1'', 1-inch Copper Pressure Pipe Fitting Plumbing Supply For aboveground use Joins straight lengths of copper tubing C x C copper to copper connection type Requires pressure to maintain water flow Fitting ID Size: 1-1/8'' (OD 1-1/4''), Fitted Pipe ID Size: 1'' (OD 1-1/8'')