This pocket-sized Cornelius Keg CO2 Charger is the ideal tool for any home brewer using Cornelius kegs. This keg charger fits in your pocket and eliminates the need for cumbersome and costly CO2 tanks, regulators and hoses. Press the trigger to release CO2 into the keg; Release trigger to stop flow. Save remaining CO2 for later use. Made of high strength, glass-reinforced nylon, with brass valve internals. Only use with with these Refill Cartridges. Features: Small enough to fit in your pocket. Ideal tool for any home brewer using Cornelius kegs.