CO2 capsules - Champagne Protector 5 pcs (16g-CO2) Carbonated drinks, such as champagne or sparkling wine, quickly lose their effervescence once the bottle has been opened. To prevent this, it is advisable to use a Champagne Protector. This makes it easy to seal the bottle so that the contents can be enjoyed for longer. Inert gas from the CO2 cartridge The use of suitable CO2 cartridges is necessary for the Champagne Protector to fulfil its function as intended. The CO2 serves as a protective gas and provides the right pressure to protect the contents of the opened bottle from oxygen and prevent the carbon dioxide from escaping from the drink.