Bsp38 vs Bs341 8: specs compared
Updated 05 September 2026.
5
specs differ
Bsp38 and Bs341 8 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Bsp38 | Bs341 8 |
|---|---|---|
| Designation | 3/8" BSP (G3/8) | W21.8 (British designation) |
| Size / thread | 3/8" BSP (G3/8) parallel | 21.8 mm x 14 TPI right hand, external (the W21.8 thread) |
| Fitting form | parallel pipe thread | cylinder valve outlet nut, external |
| Seals on | flat washer on the thread face | captive O-ring or washer in the nut against the valve outlet |
| Rating / role | the smaller UK dispense thread on some shanks, John Guest stem adapters and inline taps | the British Standard 341 designation for the CO2 cylinder outlet used across the UK |
Questions and answers
How do Bsp38 and Bs341 8 compare?
Bsp38 and Bs341 8 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.