Post Firestone vs Jg12i: specs compared
Updated 05 September 2026.
6
specs differ
Post Firestone and Jg12i differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.
| Spec | Post Firestone | Jg12i |
|---|---|---|
| Designation | 9/16"-18 UNF | 1/2" (12.7 mm) OD |
| Size / thread | 9/16"-18 UNF (about 14.3 mm major) | 1/2" (12.7 mm) OD tube |
| Fitting form | UNF male post thread | push-fit collet, imperial |
| Seals on | poppet inside the post; post base O-ring seals to the keg lid | single O-ring plus a stainless collet grab-ring |
| Rating / role | gas and liquid posts share the thread; disconnect snaps over the outside | John Guest Speedfit imperial fittings for 1/2 inch OD tube |
| Tube OD | 12.7 mm |
Questions and answers
How do Post Firestone and Jg12i compare?
Post Firestone and Jg12i differ on 6 specs: designation, size / thread, fitting form, seals on, rating / role, tube od.