These connect directly. EVABarrier 5mm ID x 8mm OD line mates with Duotight 8mm push-in without an adapter. Sealing method, the real-world trap, and the exact part to buy.
Updated 05 September 2026.
Connect EVABarrier 5mm ID x 8mm OD line to Duotight 8mm push-in
How to join 5 mm ID / 8 mm OD and 8 mm (5/16") OD, and what stops it leaking.
These connect directly. EVABarrier 5mm ID x 8mm OD line mates with Duotight 8mm push-in without an adapter.
The two ends
- End A
- EVABarrier 5mm ID x 8mm OD line (5 mm ID / 8 mm OD)
- End B
- Duotight 8mm push-in (8 mm (5/16") OD)
- A seals on
- the 8mm OD is what a Duotight 8mm or John Guest 5/16 collet grips
- B seals on
- double EPDM O-ring on the tube outer wall
- Part needed
- none, direct fit
EVABarrier 5mm ID x 8mm OD line shares the 8mm outer wall with the 4mm line, so it takes the same 8mm Duotight fittings, but its wider 5mm bore suits beer runs that the narrow 4mm line would pour too slowly.
Both 4mm and 5mm ID lines are 8mm on the outside, so the fitting is the same; choose the bore by duty, 4mm for gas and 5mm for beer. Do not judge the fitting size by the bore, only by the 8mm outer wall.
Related connections
Questions and answers
Connect EVABarrier 5mm ID x 8mm OD line to Duotight 8mm push-in?
These connect directly. EVABarrier 5mm ID x 8mm OD line mates with Duotight 8mm push-in without an adapter.