A CO2 tank is a container designed to store carbon dioxide gas under high pressure. These tanks are commonly used in various applications, including beverage carbonation, welding, and as a propellant in paintball guns. The tanks are typically made of steel or aluminum and come in different sizes to suit specific needs. When using a CO2 tank, it is essential to handle it safely, as the high pressure can pose risks if not managed properly. Regular inspections and maintenance are necessary to ensure the tank remains in good condition and functions effectively in its intended application, such as in soda fountains or aquariums.