Ball-lock gas disconnect (MFL vs Ball-lock liquid disconnect (MFL) (black QD: specs compared
Updated 05 September 2026.
4
specs differ
Ball-lock gas disconnect (MFL and Ball-lock liquid disconnect (MFL) (black QD differ on 4 specs: designation, size / thread, fitting form, rating / role.
| Spec | Ball-lock gas disconnect (MFL | Ball-lock liquid disconnect (MFL) (black QD |
|---|---|---|
| Designation | grey QD, 1/4" MFL tail | black QD, 1/4" MFL tail |
| Size / thread | snaps over the gas post; 1/4" MFL (7/16-20 UNF) tail, often with an integrated check valve | snaps over the liquid post; 1/4" MFL (7/16-20 UNF) tail |
| Fitting form | snap-on gas quick disconnect | snap-on liquid quick disconnect |
| Seals on | O-ring over the post shoulder; flare face at the MFL tail | O-ring over the post shoulder; flare face at the MFL tail |
| Rating / role | the gas-side ball-lock disconnect, keyed to the gas post and usually grey or white | the liquid-side ball-lock disconnect, keyed to the liquid post and usually black |
Questions and answers
How do Ball-lock gas disconnect (MFL and Ball-lock liquid disconnect (MFL) (black QD compare?
Ball-lock gas disconnect (MFL and Ball-lock liquid disconnect (MFL) (black QD differ on 4 specs: designation, size / thread, fitting form, rating / role.