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The parts most likely to need an adapter

Name: The parts most likely to need an adapter
Creator: KegFitFinder
License: https://creativecommons.org/licenses/by/4.0/

100%

Duotight 9.5mm push-in needs an adapter or does not fit in 100% of the combinations we checked, the highest share in the dataset.

Which part most often needs an adapter?

Duotight 9.5mm push-in tops the list: 9 of its 9 checked combinations (100%) need an adapter or do not fit. The full ranking is below.

#	Parts	Adapter	No fit	Adapter-or-no rate
1	Duotight 9.5mm push-in	9	0	100%
2	MFL male flare (1/4")	8	0	62%
3	Duotight 8mm push-in	8	0	100%
4	CGA-320 CO2 cylinder valve	6	2	100%
5	Sanke D coupler (American Sankey)	2	3	56%
6	W21.8 CO2 cylinder valve	4	1	100%
7	5/8" BSP beer thread (shank / coupler)	3	1	57%
8	FFL female flare (1/4")	4	0	80%
9	Duotight 6.5mm push-in	4	0	100%
10	Ball-lock quick disconnect	2	1	75%
11	KeyKeg (DSI) coupler	1	2	75%
12	John Guest 5/16" push-fit	3	0	100%
13	Cornelius corny keg post	1	2	100%
14	Cornelius pin-lock keg post	1	2	100%
15	John Guest 3/8" push-fit	2	0	67%
16	TR21-4 soda cylinder valve	2	0	67%
17	CGA-580 nitrogen / beer-gas cylinder valve	0	2	67%
18	SodaStream CO2 cylinder	2	0	67%
19	1/4" NPT	2	0	100%
20	G5/8 regulator inlet	2	0	100%
21	Sanke S coupler (European Sankey)	0	2	100%
22	Sanke U coupler (Guinness / nitro)	1	1	100%
23	16g threaded CO2 cartridge	0	2	100%
24	5/16" barb (gas)	1	0	20%
25	US beer nut (hex tailpiece nut)	0	1	25%
26	Nitrogen / beer-gas regulator	1	0	33%
27	Beer tailpiece (barb + hex)	0	1	33%
28	3/8" BSP shank thread	0	1	50%
29	Pin-lock quick disconnect	0	1	50%
30	90 degree elbow tailpiece	0	1	50%
31	Firestone / Spartanburg corny keg post	0	1	100%
32	Firestone pin-lock keg post	0	1	100%
33	Faucet coupling nut	0	1	100%
34	Sanke A coupler (German slider)	0	1	100%
35	Sanke G coupler (Grundy)	0	1	100%
36	74g threaded CO2 cartridge	0	1	100%
37	M10x1 CO2 cartridge thread	1	0	100%

How this is worked out

For every part we counted the combinations that resolve to an adapter fit or a no-fit across the reference set, and ranked by that count. The rate is those combinations divided by all combinations checked for that item.

Data as of 2026-09-05.

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The parts most likely to need an adapter

Which part most often needs an adapter?

How this is worked out

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