Firestone pin-lock keg post (gas 9/16"-18 vs GAS Checkvalve: specs compared
Updated 05 September 2026.
5
specs differ
Firestone pin-lock keg post (gas 9/16"-18 and GAS Checkvalve differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Firestone pin-lock keg post (gas 9/16"-18 | GAS Checkvalve |
|---|---|---|
| Designation | gas 9/16"-18, liquid 5/8"-18 | 1/4" FFL x 1/4" MFL |
| Size / thread | gas post 9/16"-18 UNF, liquid post 5/8"-18 UNF (different sizes) | 1/4" FFL (7/16-20 UNF) inlet and 1/4" MFL (7/16-20 UNF) outlet, or barb ends |
| Fitting form | UNF male post thread | one-way flare check valve |
| Seals on | poppet inside the post; post base O-ring seals to the keg lid | flare faces at each flare end; barb under a clamp on barb versions |
| Rating / role | Firestone, Challenger and Super Challenger pin-lock kegs | passes CO2 toward the keg and blocks beer or foam from returning up the gas line |
Questions and answers
How do Firestone pin-lock keg post (gas 9/16"-18 and GAS Checkvalve compare?
Firestone pin-lock keg post (gas 9/16"-18 and GAS Checkvalve differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.