AiraceUSA Bike 2-in-1 CO2 Reversible Inflator & Mini Hand Pump, Black This item is a dual-purpose necessity while riding your bike Can be used interchangeably between Presta, Schrader and Dunlop air valves Valve for hand pump: push the locking ring up towards the pump head to not interfere with the pump while inflating tire The 2-in-2 CO2 tire inflator works also as a mini hand pump that works for road bikes or mountain bikes The inflator comes with a detachable CO2 cartridge sleeve for easy grip when in use