JG4 vs JG6: specs compared
Updated 05 September 2026.
6 mm
JG6 wins on tube outer diameter
On tube outer diameter, JG6 leads: 6 mm versus 4 mm.
| Spec | JG4 | JG6 |
|---|---|---|
| Designation | 4 mm OD | 6 mm OD |
| Size / thread | 4 mm OD tube | 6 mm OD tube |
| Fitting form | push-fit collet, metric | push-fit collet, metric |
| Seals on | single O-ring plus a stainless collet grab-ring | single O-ring plus a stainless collet grab-ring |
| Rating / role | John Guest Speedfit metric fittings for 4mm OD tube; tube OD must be within 0.1mm of nominal | John Guest Speedfit metric fittings for 6mm OD tube; tube OD within 0.1mm of nominal |
| Tube OD | 4 mm | 6 mm |
Questions and answers
Which has the higher tube outer diameter, JG4 or JG6?
On tube outer diameter, JG6 leads: 6 mm versus 4 mm.
How do JG4 and JG6 compare?
On tube outer diameter, JG6 leads: 6 mm versus 4 mm.