Elbow TP vs Ball-lock quick disconnect (ball-lock QD: specs compared
Updated 05 September 2026.
5
specs differ
Elbow TP and Ball-lock quick disconnect (ball-lock QD differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.
| Spec | Elbow TP | Ball-lock quick disconnect (ball-lock QD |
|---|---|---|
| Designation | 5/8" G nut x 5/16" barb | ball-lock QD, MFL or barb tail |
| Size / thread | 5/8" G (BSP) hex nut on one end, 5/16" hose barb at 90 degrees | snaps over the corny post; tail is 1/4" MFL (7/16-20 UNF) or a 1/4"/5/16" barb |
| Fitting form | right-angle barbed tailpiece | snap-on quick disconnect |
| Seals on | flat washer against the shank or coupler face; barb under a worm clamp | O-ring seals over the post shoulder; the tail seals by flare or clamp |
| Rating / role | turns a beer line down or sideways in tight kegerator space | the universal ball-lock keg connector; gas and liquid are keyed differently |
Questions and answers
How do Elbow TP and Ball-lock quick disconnect (ball-lock QD compare?
Elbow TP and Ball-lock quick disconnect (ball-lock QD differ on 5 specs: designation, size / thread, fitting form, seals on, rating / role.