CO2 Tank Power Filler III Transfill Tool Larger Tanks from Power Tank. The Power Fill-III CO2 Transfiller Tool is used to fill CO2 bottles from larger CO2 tanks. CGA-320 to CGA-320. Unless your mother tank has a siphon tube inside you will need to flip your mother tank upside down to get the gas to the valve.

Note: Liquid CO2 does not transfill like most compressed gases. A CO2 pump is usually necessary for complete fills. A large temperature differential between the mother bottle and the small bottle will help the transfill process. We recommend the small bottle to be at least 40°F colder than the mother bottle before filling. 30 min. in a freezer or in a bucket of ice water are two good ways to chill the small bottle. 

You will only be able to get three 5 lb. fills from a 20 lb. tank.