With the right equipment, inflating your tires with a CO2 cartridge can be as easy as achieving the perfect pour. Portland Design Works' Barkeep C02 Inflator is compatible with Presta or Schrader valves and threads on for extra reassurance that your precious C02 will end up in the right place when you're stuck on the side of the road. Its Tap Handle allows you to keep control of airflow, and like a good bartender, won't give your tires more air than they can handle at once.