AiraceUSA Bike Extra CO2 Tank Refill Cartridge for Select Airace Mini CO2 Pumps, AI-CO2-1 Extra CO2 Tank Refil for Select Airace Mini CO2 Pumps 16G Threaded CO2 Cartridge. Refill tank for Airace pumps: Turbo Micro, Turbo Road/CO2, and Turbo Mountain CO2. (Note: Mini pump NOT included.)