JG8 vs Keykeg: specs compared
Updated 05 September 2026.
6
specs differ
JG8 and Keykeg differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | JG8 | Keykeg |
|---|---|---|
| Designation | 5/16" (8 mm) OD | KeyKeg / DSI head |
| Size / thread | 5/16" (about 7.94 mm) | 5/8" BSP beer and gas dispense ports; DSI probe for KeyKeg valves |
| Fitting form | push-fit collet, imperial | single-probe keg coupler, KeyKeg valve |
| Seals on | single O-ring plus stainless collet grab-ring | flat washer on each threaded dispense port |
| Rating / role | John Guest Speedfit rated 16 bar at 1 C, 10 bar at 20 C | the coupler for one-way KeyKeg and DSI-valve kegs, common in craft and cider |
| Tube OD | 7.94 mm |
Questions and answers
How do JG8 and Keykeg compare?
JG8 and Keykeg differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.