DUO QD Liq8 vs EVA 4ID: specs compared
Updated 05 September 2026.
6
specs differ
DUO QD Liq8 and EVA 4ID differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | DUO QD Liq8 | EVA 4ID |
|---|---|---|
| Designation | black QD, 8mm push-in tail | 4 mm ID / 8 mm OD |
| Size / thread | snaps over the liquid post; integrated 8mm push-in tail | 4 mm inner diameter, 8 mm outer diameter double-wall EVA line |
| Fitting form | snap-on liquid QD with integrated push-in | double-wall EVA beer / gas tubing |
| Seals on | O-ring over the post shoulder; 8mm push-in O-rings on the tube | the 8mm OD is what a Duotight 8mm or John Guest 5/16 collet grips |
| Rating / role | the liquid-side ball-lock disconnect with a built-in 8mm Duotight | low gas permeability line matched to the 8mm push-in size; fitting rated to 100 psi, tube burst well above |
| Tube OD | 8 mm |
Questions and answers
How do DUO QD Liq8 and EVA 4ID compare?
DUO QD Liq8 and EVA 4ID differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.