KegFitFinder

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.

SpecDuo65Duo8
Designation6.5 mm (1/4") OD8 mm (5/16") OD
Size / thread6.5 mm (1/4")8 mm (5/16")
Fitting formpush-in collet, metricpush-in collet, metric
Seals ondouble EPDM O-ring on the tube outer walldouble EPDM O-ring on the tube outer wall
Rating / rolefitting rated to 100 psi; matched to EVABarrier 4mm ID x 6.5mm OD tubefitting rated to 100 psi; EVABarrier tube burst over 300 psi at 25 C
Tube OD6.5 mm8 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.

Compared here

Duotight 6.5mm push-in (6.5 mm (1/4") OD)Duotight 8mm push-in (8 mm (5/16") OD)