evo.com | Specialized CO2 > With a button and guage, the Specialized CPRO2 Gauge Trigger CO2 Inflator makes it easier than ever to inflate your tires to your preferred PSI. All USA Orders Containing CO2 Cartridges will Ship FedEx Ground Accommodates Threaded 16g and 25g Cartridges Gauge Confirms Proper Inflation, Makes It Easy to Adjust Pressure Mid-Ride Thumb Trigger Gives Precise Control One 16g Co2 Cartridge Included | Specialized CPRO2 Gauge Trigger CO2 Inflator 2024 in Black