SodaStream CO2 adapters are available from websites that specialize in creating adapters for SodaStream tanks, such as SodaMod.com, and from major online marketplaces, such as Amazon.com. SodaStream adapters are also commonly available on auction websites such as eBay.
SodaStream adapters typically require small modifications to the unit letting owners use larger CO2 tanks than are normally available with SodaStream. Numerous guides are available online, at websites such as Geeks.com, that detail the process used to convert SodaStream units to accommodate larger tanks. Adapters are typically used to let customers purchase tanks from sporting goods stores and paintball shooting ranges instead of from pre-determined SodaStream retailers.