Keep extra carbonation on hand for your machine with this SodaStream spare CO2 cylinder. Compatibility with SodaStream sparkling water makers (not included) ensures a seamless fit and effortless carbonation, and the lightweight construction is durable for safe use. Simply snap into place for refreshing sparkling water beverages for up to 8 weeks, depending on carbonation levels. Featuring a recyclable design, this SodaStream spare CO2 cylinder can be exchanged for a replacement bottle when empty | Sodastream CO2 Spare Carbonating Cylinder Size 15oz425g