20 mm barb (to 1/2" or 3/4" BSP) vs 40 mm barb (to 1-1/4" or 1-1/2" BSP): specs compared
Updated 05 September 2026.
3
specs differ
20 mm barb (to 1/2" or 3/4" BSP) and 40 mm barb (to 1-1/4" or 1-1/2" BSP) differ on 3 specs: barb size, thread options, use.
| Spec | 20 mm barb (to 1/2" or 3/4" BSP) | 40 mm barb (to 1-1/4" or 1-1/2" BSP) |
|---|---|---|
| Barb size | 20 mm hose bore | 40 mm hose bore (1 1/2 inch) |
| Thread options | 1/2 inch BSP or 3/4 inch BSP | 1 1/4 inch BSP or 1 1/2 inch BSP |
| Seals with | a Jubilee clip over the barb | a Jubilee clip over the barb |
| Use | small pond pumps, filters and water features | high-flow pumps, large gravity filters and waterfalls |
Questions and answers
How do 20 mm barb (to 1/2" or 3/4" BSP) and 40 mm barb (to 1-1/4" or 1-1/2" BSP) compare?
20 mm barb (to 1/2" or 3/4" BSP) and 40 mm barb (to 1-1/4" or 1-1/2" BSP) differ on 3 specs: barb size, thread options, use.