Ball-lock quick disconnect (ball-lock QD vs Cga320: specs compared
Updated 05 September 2026.
5
specs differ
Ball-lock quick disconnect (ball-lock QD and Cga320 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Ball-lock quick disconnect (ball-lock QD | Cga320 |
|---|---|---|
| Designation | ball-lock QD, MFL or barb tail | 0.825"-14 NGO RH |
| Size / thread | snaps over the corny post; tail is 1/4" MFL (7/16-20 UNF) or a 1/4"/5/16" barb | 0.825"-14 NGO (National Gas Outlet), right hand |
| Fitting form | snap-on quick disconnect | cylinder valve outlet nut, external |
| Seals on | O-ring seals over the post shoulder; the tail seals by flare or clamp | nylon or fibre washer inside the nut against the valve outlet |
| Rating / role | the universal ball-lock keg connector; gas and liquid are keyed differently | the North American CO2 cylinder connection, on refillable tanks up to about 1800 psi |
Questions and answers
How do Ball-lock quick disconnect (ball-lock QD and Cga320 compare?
Ball-lock quick disconnect (ball-lock QD and Cga320 differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.