Review on CGA320 G1/2 CO2 Cylinder Refill Adapter: A Complete Kit for Filling Soda Makers & Tanks by Ryan Saxton

Works very well compared to other more expensive versions. Get 978 grams for the pointed valve can and 950 grams for the flat valve can, which is very close to the commercial 1070 grams. The caveat is that 1) you need a tank with a pointed valve, not the current flat valve. Try finding it on ebay; 2) You need to read the instructions carefully, maybe some YouTube videos; 3) If using a flat valve, take your time; 4) For a cheap 5lb tank that doesn't have a siphon, you MUST turn the tank upside down or you won't be able to fill the tank more than 1/3 of capacity. The only downside is that the pressure gauge is very misleading and inaccurate. You just wait for the tank to stop filling and then stop. Overall great.