Small portable CO2 bike pump that helps you fix flats fast: ideal Co2 bike Tire inflator to carry with you on every ride, including your bike Fits all tires: auto head fits both Presto and Schrader valves Works with threaded Co2 cartridges: only compatible with threaded cartridges Incredibly portable: small size fits in saddle bag or jersey pocket Reliable for every use: impact resistant body and precision machined head with Inflation control 2. 0Tm knob