25mm Type B copper pipe for hot and cold water plumbing, supplied in a 6m straight length. The DN25 nominal size has an outside diameter of 25.40mm.
Nominal copper sizes are trade designations. They do not describe the actual outside diameter, so use the dimension table when matching tube and fittings.
Working pressure depends on the tube size, temper, operating temperature and jointing system. Use copper-tube fittings and jointing methods suitable for the intended service.
Copper pipe dimensions
Approximate dimensions in mm.
| Nominal size (DN) |
Outside diameter |
Internal diameter |
Wall thickness |
|---|---|---|---|
| 15 | 12.70 | 10.88 | 0.91 |
| 20 | 19.05 | 17.01 | 1.02 |
| 25 | 25.40 | 22.96 | 1.22 |
Internal diameters are approximate, calculated from outside diameter minus twice the wall thickness.