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The most broadly compatible parts
5
MFL male flare (1/4") fits 5 of the combinations we checked directly, more than any other of the 18 parts in the dataset.
Which part fits the most setups?
MFL male flare (1/4") is the most broadly compatible, fitting 5 combinations directly (38% of the 13 we checked for it). The full ranking is below.
| # | Parts | Direct fits | Combinations checked | Direct-fit rate |
|---|---|---|---|---|
| 1 | MFL male flare (1/4") | 5 | 13 | 38% |
| 2 | Sanke D coupler (American Sankey) | 4 | 9 | 44% |
| 3 | 5/16" barb (gas) | 4 | 5 | 80% |
| 4 | 5/8" BSP beer thread (shank / coupler) | 3 | 7 | 43% |
| 5 | US beer nut (hex tailpiece nut) | 3 | 4 | 75% |
| 6 | 1/4" barb (liquid) | 3 | 3 | 100% |
| 7 | Nitrogen / beer-gas regulator | 2 | 3 | 67% |
| 8 | Beer tailpiece (barb + hex) | 2 | 3 | 67% |
| 9 | FFL female flare (1/4") | 1 | 5 | 20% |
| 10 | Ball-lock quick disconnect | 1 | 4 | 25% |
| 11 | KeyKeg (DSI) coupler | 1 | 4 | 25% |
| 12 | John Guest 3/8" push-fit | 1 | 3 | 33% |
| 13 | TR21-4 soda cylinder valve | 1 | 3 | 33% |
| 14 | CGA-580 nitrogen / beer-gas cylinder valve | 1 | 3 | 33% |
| 15 | SodaStream CO2 cylinder | 1 | 3 | 33% |
| 16 | 3/8" BSP shank thread | 1 | 2 | 50% |
| 17 | Pin-lock quick disconnect | 1 | 2 | 50% |
| 18 | 90 degree elbow tailpiece | 1 | 2 | 50% |
How this is worked out
For every part we counted the compatibility combinations that resolve to a direct fit (no adapter needed) across every combination in the reference set, and ranked by that count. The direct-fit rate is direct fits divided by all combinations checked for that item.
Data as of 2026-09-05.
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