GU Thread Adapter vs GAS Checkvalve: specs compared
Updated 05 September 2026.
5
specs differ
GU Thread Adapter and GAS Checkvalve differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | GU Thread Adapter | GAS Checkvalve |
|---|---|---|
| Designation | 13/16"-14 to 7/8"-14 | 1/4" FFL x 1/4" MFL |
| Size / thread | 1/2" BSP (13/16"-14) one end, 5/8" BSP (7/8"-14) the other | 1/4" FFL (7/16-20 UNF) inlet and 1/4" MFL (7/16-20 UNF) outlet, or barb ends |
| Fitting form | port thread adapter | one-way flare check valve |
| Seals on | flat washer on each threaded face | flare faces at each flare end; barb under a clamp on barb versions |
| Rating / role | 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 | passes CO2 toward the keg and blocks beer or foam from returning up the gas line |
Questions and answers
How do GU Thread Adapter and GAS Checkvalve compare?
GU Thread Adapter and GAS Checkvalve differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.