Nashbar CO2 Mini Pump Use a CO2 cartridge for quick results or use ol' fashioned elbow grease to get up to pressure The cutout thumb lock-lever prevents premature release (of the CO2!), and the convenient T-handle makes pumping to pressure easier Equipped with a dual head Presta/Schrader valve and includes bottle cage mounting clip and one 12g CO2 cartridge Compatible with 12g threaded or non-threaded, or larger sized threaded cartridges without the installation of the cup/pump body