These connect directly. EVABarrier 6.3mm ID x 9.5mm OD line mates with Duotight 9.5mm push-in without an adapter. Sealing method, the real-world trap, and the exact part to buy.
Updated 05 September 2026.
Connect EVABarrier 6.3mm ID x 9.5mm OD line to Duotight 9.5mm push-in
How to join 6.3 mm ID / 9.5 mm OD and 9.5 mm (3/8") OD, and what stops it leaking.
These connect directly. EVABarrier 6.3mm ID x 9.5mm OD line mates with Duotight 9.5mm push-in without an adapter.
The two ends
- End A
- EVABarrier 6.3mm ID x 9.5mm OD line (6.3 mm ID / 9.5 mm OD)
- End B
- Duotight 9.5mm push-in (9.5 mm (3/8") OD)
- A seals on
- the 9.5mm OD is what a Duotight 9.5mm or John Guest 3/8 collet grips
- B seals on
- double EPDM O-ring on the tube outer wall
- Part needed
- none, direct fit
EVABarrier 6.3mm ID x 9.5mm OD line is gripped by its 9.5mm outer wall, so it push-fits into a 9.5mm Duotight body. The wider 6.3mm bore lowers pour resistance, which suits long beer runs and UK 3/8 dispense.
The 9.5mm OD is what the fitting grips, and it will not seat in an 8mm collet, so keep 9.5mm line on 9.5mm fittings. Step down to the 8mm system only through a proper reducer, never by forcing the larger tube into a smaller collet.
Related connections
Questions and answers
Connect EVABarrier 6.3mm ID x 9.5mm OD line to Duotight 9.5mm push-in?
These connect directly. EVABarrier 6.3mm ID x 9.5mm OD line mates with Duotight 9.5mm push-in without an adapter.