Din477 6 vs Duo65: specs compared
Updated 05 September 2026.
6
specs differ
Din477 6 and Duo65 differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | Din477 6 | Duo65 |
|---|---|---|
| Designation | W21.8 x 1/14" RH | 6.5 mm (1/4") OD |
| Size / thread | W21.8 x 1/14" (21.8 mm, 14 TPI) right hand, external | 6.5 mm (1/4") |
| Fitting form | cylinder valve outlet nut, external | push-in collet, metric |
| Seals on | captive O-ring or washer in the nut against the valve outlet | double EPDM O-ring on the tube outer wall |
| Rating / role | the German DIN 477 designation for the European CO2 outlet, the same physical thread as W21.8 and BS 341 No.8 | fitting rated to 100 psi; matched to EVABarrier 4mm ID x 6.5mm OD tube |
| Tube OD | 6.5 mm |
Questions and answers
How do Din477 6 and Duo65 compare?
Din477 6 and Duo65 differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.