JG4 vs Keykeg: specs compared
Updated 05 September 2026.
6
specs differ
JG4 and Keykeg differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | JG4 | Keykeg |
|---|---|---|
| Designation | 4 mm OD | KeyKeg / DSI head |
| Size / thread | 4 mm OD tube | 5/8" BSP beer and gas dispense ports; DSI probe for KeyKeg valves |
| Fitting form | push-fit collet, metric | single-probe keg coupler, KeyKeg valve |
| Seals on | single O-ring plus a stainless collet grab-ring | flat washer on each threaded dispense port |
| Rating / role | John Guest Speedfit metric fittings for 4mm OD tube; tube OD must be within 0.1mm of nominal | the coupler for one-way KeyKeg and DSI-valve kegs, common in craft and cider |
| Tube OD | 4 mm |
Questions and answers
How do JG4 and Keykeg compare?
JG4 and Keykeg differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.