The Zefal EZ-Push Threaded Cartridge Regulating Inflator is compact, lightweight and made of aluminum with a thermoplastic cover. It is compatible with 12g, 16g and 25g threaded cartridges with Schrader, Presta and Dunlop valves. In addition, its Z-Push system allows you to control the amount of gas to be injected and the cartridge only empties during inflation when the pump comes into contact with the valve.