Topeak Nano AirBooster Co2 Inflator Head – Black. An extremely compact lightweight and easy-to-use CO2 inflator. Precision CNC machined aluminum inflator fits Presta and Schrader valves and works with threaded 16g or 25g cartridges. Simply screw the cartridge in tight and then screw the head onto the valve unscrew the cartridge a half turn to inflate tire.