Replacement part for the Crystal Aqua CO2 regulator! Seal A Replacement Part for Crystal Aqua CO2 Regulator (SS-1GR01, SS-2GR01), Compatible with SS-1GR01SS-2GR01 Features: Replacement part for Crystal Aqua CO2 generators. Recommended to replace it when it is damaged or to keep it as a spare. Quantity: 1 piece