Cyl-Tec 1.5 lb CO2 Tank - Aluminum Cylinder with CGA320 Valve This 1.5lb aluminum CO2 cylinder is great for home beverage carbonation or any application that uses carbon dioxide. Great for use with kegs or home brewing! Other applications include hydroponics, aquariums and more Ships ready to fill (empty). Federal law requires that this tank ship without being filled. The tank has 1800 PSI service pressure. Certified for use in the U.S.(DOT) and Canada (T.C.). The tank is stamped with these markings. Made from high quality 6061-T6 brushed aluminum to ensure durability. Aluminum tanks will not rust as steel tanks do over time Includes new brass CGA 320 CO2 valve. 320 valves are approved by the Compressed Gas Association (CGA) and have a male thread for CO2 regulators.