13 mm (about 1/2" nominal) vs 4/7 mm (4 mm ID x 7 mm OD): specs compared
Updated 05 September 2026.
6
specs differ
13 mm (about 1/2" nominal) and 4/7 mm (4 mm ID x 7 mm OD) differ on 6 specs: outer diameter, role, fitting type, common kit, inner diameter, working pressure.
| Spec | 13 mm (about 1/2" nominal) | 4/7 mm (4 mm ID x 7 mm OD) |
|---|---|---|
| Outer diameter | about 13 mm (barb sized 13 mm / 0.51 inch) | 7 mm |
| Role | small supply / branch line off a 16 mm main | |
| Fitting type | insert barb or compression collar | push-in barb sized to the 4 mm bore |
| Common kit | sold paired with 16 mm pipe in starter sets | |
| Inner diameter | 4 mm | |
| Working pressure | 0.2 to 1 MPa (about 2 to 10 bar) |
Questions and answers
How do 13 mm (about 1/2" nominal) and 4/7 mm (4 mm ID x 7 mm OD) compare?
13 mm (about 1/2" nominal) and 4/7 mm (4 mm ID x 7 mm OD) differ on 6 specs: outer diameter, role, fitting type, common kit, inner diameter, working pressure.