My Keg On Legs 2.3kg CylinderMykegonlegs supply brand new Catalina Carbon Dioxide (CO2) Gas Cylinders throughout Australia. They are an Australian company committed to improving life for the average aquarium hobbyist by providing an alternative to expensive CO2 cylinder rental. These Catalina CO2 cylinders are a more economical size for an aquarium hobbyist. All Mykegonlegs cylinders feature a high quality factory powder coated finish, are made from high strength, lightweight aluminum alloy and generally have a working life well in excess of 50 years. All cylinders and valves are compliant with current Australian safety and regulatory standards.