Din477 6 vs DUO QD Liq8: specs compared
Updated 05 September 2026.
5
specs differ
Din477 6 and DUO QD Liq8 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Din477 6 | DUO QD Liq8 |
|---|---|---|
| Designation | W21.8 x 1/14" RH | black QD, 8mm push-in tail |
| Size / thread | W21.8 x 1/14" (21.8 mm, 14 TPI) right hand, external | snaps over the liquid post; integrated 8mm push-in tail |
| Fitting form | cylinder valve outlet nut, external | snap-on liquid QD with integrated push-in |
| Seals on | captive O-ring or washer in the nut against the valve outlet | O-ring over the post shoulder; 8mm push-in O-rings on the tube |
| Rating / role | the German DIN 477 designation for the European CO2 outlet, the same physical thread as W21.8 and BS 341 No.8 | the liquid-side ball-lock disconnect with a built-in 8mm Duotight |
Questions and answers
How do Din477 6 and DUO QD Liq8 compare?
Din477 6 and DUO QD Liq8 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.