Firestone pin-lock keg post (gas 9/16"-18 vs G5/8 regulator inlet (G5/8 (BSP parallel)): specs compared
Updated 05 September 2026.
5
specs differ
Firestone pin-lock keg post (gas 9/16"-18 and G5/8 regulator inlet (G5/8 (BSP parallel)) differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Firestone pin-lock keg post (gas 9/16"-18 | G5/8 regulator inlet (G5/8 (BSP parallel)) |
|---|---|---|
| Designation | gas 9/16"-18, liquid 5/8"-18 | G5/8 (BSP parallel) |
| Size / thread | gas post 9/16"-18 UNF, liquid post 5/8"-18 UNF (different sizes) | G5/8 (5/8" BSP parallel) |
| Fitting form | UNF male post thread | parallel pipe thread, regulator side |
| Seals on | poppet inside the post; post base O-ring seals to the keg lid | flat washer on the face of the inlet |
| Rating / role | Firestone, Challenger and Super Challenger pin-lock kegs | a common regulator inlet thread that a CGA-320 or W21.8 adapter presents |
Questions and answers
How do Firestone pin-lock keg post (gas 9/16"-18 and G5/8 regulator inlet (G5/8 (BSP parallel)) compare?
Firestone pin-lock keg post (gas 9/16"-18 and G5/8 regulator inlet (G5/8 (BSP parallel)) differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.