The zefal ez push is a mini co2 inflator for threaded cartridges it features an ips inflate push system for an accurate and easy flow regulation the cartridge will be emptied only when the pump comes into contact with the valve key features zefal ez push mini co2 inflator designed for threaded cartridges ips inflate push system accurate and easy flow regulation cartridge will only empty when it comes in contact with the valve includes 16g cartridge