1/2" US (0.700" OD) vs 13 mm (about 1/2" nominal): specs compared
Updated 05 September 2026.
6
specs differ
1/2" US (0.700" OD) and 13 mm (about 1/2" nominal) differ on 6 specs: outer diameter, inner diameter, fitting type, trap, role, common kit.
| Spec | 1/2" US (0.700" OD) | 13 mm (about 1/2" nominal) |
|---|---|---|
| Outer diameter | 0.700 inch (varies 0.620 to 0.710 inch by brand) | about 13 mm (barb sized 13 mm / 0.51 inch) |
| Inner diameter | about 0.600 inch | |
| Fitting type | .700 barb, compression or Perma-Loc | insert barb or compression collar |
| Trap | labelled 1/2 inch but not 16 mm metric | |
| Role | small supply / branch line off a 16 mm main | |
| Common kit | sold paired with 16 mm pipe in starter sets |
Questions and answers
How do 1/2" US (0.700" OD) and 13 mm (about 1/2" nominal) compare?
1/2" US (0.700" OD) and 13 mm (about 1/2" nominal) differ on 6 specs: outer diameter, inner diameter, fitting type, trap, role, common kit.