Soda Stream Alcojet Soda-Club REFILL Gas cartridge dioxide cartridge CO2, DIY.
This adapter allows you to link Soda-Club / Soda Stream on a standard w21.8-14 OR CGA-320 Valve Donor CO2 Tank and refill.
It is not difficult and takes only minutes. You also need a donor tank and a Sodastream tank.
See how it works: