G5/8 regulator inlet (G5/8 (BSP parallel)) vs GAS Checkvalve: specs compared
Updated 05 September 2026.
5
specs differ
G5/8 regulator inlet (G5/8 (BSP parallel)) and GAS Checkvalve differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | G5/8 regulator inlet (G5/8 (BSP parallel)) | GAS Checkvalve |
|---|---|---|
| Designation | G5/8 (BSP parallel) | 1/4" FFL x 1/4" MFL |
| Size / thread | G5/8 (5/8" BSP parallel) | 1/4" FFL (7/16-20 UNF) inlet and 1/4" MFL (7/16-20 UNF) outlet, or barb ends |
| Fitting form | parallel pipe thread, regulator side | one-way flare check valve |
| Seals on | flat washer on the face of the inlet | flare faces at each flare end; barb under a clamp on barb versions |
| Rating / role | a common regulator inlet thread that a CGA-320 or W21.8 adapter presents | passes CO2 toward the keg and blocks beer or foam from returning up the gas line |
Questions and answers
How do G5/8 regulator inlet (G5/8 (BSP parallel)) and GAS Checkvalve compare?
G5/8 regulator inlet (G5/8 (BSP parallel)) and GAS Checkvalve differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.