MSW 20g CO2 Cartridge-3 Pack Bringing along a bulky air pump on your rides is a thing of the past. With the MSW CO2-20g cartridges you can inflate a tire in a fraction of the time it takes to pump up a tire with a hand pump and are small and compact making them convenient to carry. The 20-gram cartridges are sold as a pack of three and are compatible with all MSW CO2 inflators as well as other brand inflators. A single cartridge can fill a 26", 27. 5" or 29" X 2. 0"-2. 5" tire to 20-30 psi Features3/8" x 24 TPI threading Compatible with all inflators One 20g cartridge will fill a 26", 27. 5" or 29" X 2. 0"-2. 5" tire to 20-30 psi Pack of three | Msw | Co2-20 Co2 Cartridge: 20G, 3 Pack 20G, 3 Pack