Bs341 8 vs Tailpiece: specs compared
Updated 05 September 2026.
5
specs differ
Bs341 8 and Tailpiece differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Bs341 8 | Tailpiece |
|---|---|---|
| Designation | W21.8 (British designation) | 7/8"-14 nut, 1/4" or 3/16" barb |
| Size / thread | 21.8 mm x 14 TPI right hand, external (the W21.8 thread) | 7/8"-14 shoulder held by a beer nut; 1/4" or 3/16" hose barb |
| Fitting form | cylinder valve outlet nut, external | barbed nipple with a shouldered nut seat |
| Seals on | captive O-ring or washer in the nut against the valve outlet | flat washer against the shank end under the beer nut; barb under a worm clamp on the hose |
| Rating / role | the British Standard 341 designation for the CO2 cylinder outlet used across the UK | the piece that turns a shank thread into a hose barb for vinyl beer line |
Questions and answers
How do Bs341 8 and Tailpiece compare?
Bs341 8 and Tailpiece differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.