Co2 Cylinder is used to sell it commercially on a global scale under pressure. CO2 tanks have a range of applications. The most common uses are for carbonated drinks, brewing, paintball guns, medical applications, metal production, catering, and fire extinguishing.Each cylinder has a valve on top, and to prevent damage, a steel cap is put over the valve.Co2 Cylinder is very safe to use. Because this gas cannot burn, CO2 does not encourage combustion.