Firestone pin-lock keg post (gas 9/16"-18 vs GU Thread Adapter: specs compared
Updated 05 September 2026.
5
specs differ
Firestone pin-lock keg post (gas 9/16"-18 and GU Thread Adapter differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Firestone pin-lock keg post (gas 9/16"-18 | GU Thread Adapter |
|---|---|---|
| Designation | gas 9/16"-18, liquid 5/8"-18 | 13/16"-14 to 7/8"-14 |
| Size / thread | gas post 9/16"-18 UNF, liquid post 5/8"-18 UNF (different sizes) | 1/2" BSP (13/16"-14) one end, 5/8" BSP (7/8"-14) the other |
| Fitting form | UNF male post thread | port thread adapter |
| Seals on | poppet inside the post; post base O-ring seals to the keg lid | flat washer on each threaded face |
| Rating / role | Firestone, Challenger and Super Challenger pin-lock kegs | converts the 1/2" BSP (13/16"-14) beer port some G and U couplers carry to the 5/8" BSP (7/8"-14) standard |
Questions and answers
How do Firestone pin-lock keg post (gas 9/16"-18 and GU Thread Adapter compare?
Firestone pin-lock keg post (gas 9/16"-18 and GU Thread Adapter differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.