These connect directly. Mini CO2 regulator (cartridge) mates with 74g threaded CO2 cartridge without an adapter. Sealing method, the real-world trap, and the exact part to buy.
Updated 05 September 2026.
Connect Mini CO2 regulator (cartridge) to 74g threaded CO2 cartridge
How to join 5/8-18 inlet, 1/4" MFL out and 5/8"-24 UNF, and what stops it leaking.
These connect directly. Mini CO2 regulator (cartridge) mates with 74g threaded CO2 cartridge without an adapter.
The two ends
- End A
- Mini CO2 regulator (cartridge) (5/8-18 inlet, 1/4" MFL out)
- End B
- 74g threaded CO2 cartridge (5/8"-24 UNF)
- A seals on
- cartridge seat at the inlet; flare face at the outlet
- B seals on
- a pierced or valved seat in the holder against the cartridge neck
- Part needed
- none, direct fit
A mini CO2 regulator threads a 74g (5/8-18 UNF) cartridge straight onto its inlet, so no adapter is needed between them. The regulator then presents a 1/4 MFL or FFL flare outlet for a disconnect, exactly like a full regulator.
Match the cartridge to the inlet: a mini regulator built for 74g (5/8-18) will not take a 16g (3/8-24) cartridge. A cartridge holds far less than a tank, so it suits carbonating one keg, not running a bank of them.
Related connections
Questions and answers
Connect Mini CO2 regulator (cartridge) to 74g threaded CO2 cartridge?
These connect directly. Mini CO2 regulator (cartridge) mates with 74g threaded CO2 cartridge without an adapter.