Coravin Sparkling CO2 Capsules 12 PCSCoravin Pure Sparkling CO2 Capsules power your Coravin Sparkling System. These replacement Capsules are filled with pure CO2, the same gas that creates bubbles in sparkling wine, to preserve its taste and effervescence for up to 4 weeks. Each Capsule preserves up to 7 standard bottles of sparkling wine. Coravin Pure Sparkling CO2 Capsules are ONLY compatible with the Coravin Sparkling System.