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Connect 16g threaded CO2 cartridge to 74g threaded CO2 cartridge

How to join 3/8"-24 UNF and 5/8"-24 UNF, and what stops it leaking.

End A16g threaded CO2 cartridge (3/8"-24 UNF)Will not connectEnd B74g threaded CO2 cartridge (5/8"-24 UNF)

Not compatible. 16g threaded CO2 cartridge and 74g threaded CO2 cartridge do not share a mating thread, so there is no adapter between them; fit the part that matches your hardware.

The two ends

End A
16g threaded CO2 cartridge (3/8"-24 UNF)
End B
74g threaded CO2 cartridge (5/8"-24 UNF)
A seals on
a pierced or valved seat in the holder against the cartridge neck
B seals on
a pierced or valved seat in the holder against the cartridge neck
Part needed
matched replacement, no adapter exists

The part to buy

A 16 gram CO2 cartridge is 3/8-24 UNF and a 74 gram cartridge is 5/8-24 UNF, so a holder made for one will not accept the other. There is no adapter between them; you fit the holder that matches the cartridge size printed on it.

The two cartridges look similar on a shelf but thread differently, and forcing the wrong one either will not pierce or leaks all its gas at once. Read the gram size and thread before buying a holder or a pack of cartridges.

Related connections

Sources: CO2Art guide to cylinder connections: disposable/small cylinder threads (M10x1, 3/8-24 UNF 16g, 5/8-24 UNF 74g, M16x1.5 95g)