Duo65 vs Duo8: specs compared
Updated 05 September 2026.
8 mm
Duo8 wins on tube outer diameter
On tube outer diameter, Duo8 leads: 8 mm versus 6.5 mm.
| Spec | Duo65 | Duo8 |
|---|---|---|
| Designation | 6.5 mm (1/4") OD | 8 mm (5/16") OD |
| Size / thread | 6.5 mm (1/4") | 8 mm (5/16") |
| Fitting form | push-in collet, metric | push-in collet, metric |
| Seals on | double EPDM O-ring on the tube outer wall | double EPDM O-ring on the tube outer wall |
| Rating / role | fitting rated to 100 psi; matched to EVABarrier 4mm ID x 6.5mm OD tube | fitting rated to 100 psi; EVABarrier tube burst over 300 psi at 25 C |
| Tube OD | 6.5 mm | 8 mm |
Questions and answers
Which has the higher tube outer diameter, Duo65 or Duo8?
On tube outer diameter, Duo8 leads: 8 mm versus 6.5 mm.
How do Duo65 and Duo8 compare?
On tube outer diameter, Duo8 leads: 8 mm versus 6.5 mm.