The SPEED CHUCK is the most easy-to-use inflator in the XLAB line. Simply push to inflate for a fast inflation. Simply thread on CO2 cartridge, slide inflator onto valve, and push down it’s that easy. Stop pushing and CO2 flow stops. Compatible with both schrader and presta valves. Designed to be used with threaded 12g, 16g, & 24g CO2 cartridges. Weight 23g.