Our 450gram gas cylinders come full of CO2 and are ready to use. This tank is able to carbonate and dispense about 60L. Similar brands of cylinders are sold as 60L cylinders for this reason. If you are only using it to dispense beer not carbonate then you will get about 100L. These are fantastic value. The cost of the cylinder full of gas is similar to the cost of a refill of a SodaStream type cylinder. So as a result, even if you used this cylinder as a disposable it would still make a lot of sense. Features - Australian Standard Approved - Holds 450grams of CO2 when full - G1/2 Thread - Dimensions 37cm high x 6cm diameter Refills Empty cylinders can be refilled by many homebrew stores around Australia. These cylinders come with a 10 year life span before you need to re-hydro test this cylinder. After this time for CO2 fillers to be able to fill your bottle, you will need to get it hydro statically tested for your safety and theirs while