Copper Tubing Sizes (For Plumbing)

Copper Tubing Sizes (CTS) for Plumbing
Nominal Size Outside Diameter (OD)
1/4 3/8
3/8 1/2
1/2 5/8
5/8 3/4
3/4 7/8
1 1-1/8
1-1/4 1-3/8
1-1/2 1-5/8
2 2-1/8
2-1/2 2-5/8
3 3-1/8
4 4-1/8