Duo65 vs DUO QD Liq8: specs compared
Updated 05 September 2026.
6
specs differ
Duo65 and DUO QD Liq8 differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | Duo65 | DUO QD Liq8 |
|---|---|---|
| Designation | 6.5 mm (1/4") OD | black QD, 8mm push-in tail |
| Size / thread | 6.5 mm (1/4") | snaps over the liquid post; integrated 8mm push-in tail |
| Fitting form | push-in collet, metric | snap-on liquid QD with integrated push-in |
| Seals on | double EPDM O-ring on the tube outer wall | O-ring over the post shoulder; 8mm push-in O-rings on the tube |
| Rating / role | fitting rated to 100 psi; matched to EVABarrier 4mm ID x 6.5mm OD tube | the liquid-side ball-lock disconnect with a built-in 8mm Duotight |
| Tube OD | 6.5 mm |
Questions and answers
How do Duo65 and DUO QD Liq8 compare?
Duo65 and DUO QD Liq8 differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.