EVA 4ID vs FFL: specs compared
Updated 05 September 2026.
6
specs differ
EVA 4ID and FFL differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | EVA 4ID | FFL |
|---|---|---|
| Designation | 4 mm ID / 8 mm OD | 1/4" FFL (7/16"-20 UNF) |
| Size / thread | 4 mm inner diameter, 8 mm outer diameter double-wall EVA line | 7/16"-20 UNF female thread, 45 degree flare seat |
| Fitting form | double-wall EVA beer / gas tubing | SAE 45 degree flare, female |
| Seals on | the 8mm OD is what a Duotight 8mm or John Guest 5/16 collet grips | mates against a male 45 degree flare face |
| Rating / role | low gas permeability line matched to the 8mm push-in size; fitting rated to 100 psi, tube burst well above | the female half of the homebrew flare standard |
| Tube OD | 8 mm |
Questions and answers
How do EVA 4ID and FFL compare?
EVA 4ID and FFL differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.