Ball-lock liquid disconnect (MFL) (black QD vs Ball-lock quick disconnect (ball-lock QD: specs compared
Updated 05 September 2026.
5
specs differ
Ball-lock liquid disconnect (MFL) (black QD and Ball-lock quick disconnect (ball-lock QD differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Ball-lock liquid disconnect (MFL) (black QD | Ball-lock quick disconnect (ball-lock QD |
|---|---|---|
| Designation | black QD, 1/4" MFL tail | ball-lock QD, MFL or barb tail |
| Size / thread | snaps over the liquid post; 1/4" MFL (7/16-20 UNF) tail | snaps over the corny post; tail is 1/4" MFL (7/16-20 UNF) or a 1/4"/5/16" barb |
| Fitting form | snap-on liquid quick disconnect | snap-on quick disconnect |
| Seals on | O-ring over the post shoulder; flare face at the MFL tail | O-ring seals over the post shoulder; the tail seals by flare or clamp |
| Rating / role | the liquid-side ball-lock disconnect, keyed to the liquid post and usually black | the universal ball-lock keg connector; gas and liquid are keyed differently |
Questions and answers
How do Ball-lock liquid disconnect (MFL) (black QD and Ball-lock quick disconnect (ball-lock QD compare?
Ball-lock liquid disconnect (MFL) (black QD and Ball-lock quick disconnect (ball-lock QD differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.