MADE FOR HIT-AIR 50CC VESTS: Designed for Hit-Air vests requiring 50cc CO2 cartridges, including all size HDS, all size MX9, MLV size small, MLV2 size small, MLV3 in sizes x-small and small, VHR in sizes small and medium, ST size small, VH in sizes small and medium, H2 in sizes x-small, small, medium. Models update every few years. Please contact if you have a previous system for assistance. EASY INSTALLATION: Each 50cc cartridge installs quickly and securely—designed to replace used canisters after activation. RELIABLE SAFETY: Delivers rapid inflation in case of impact to protect motorcyclists and equestrians with a proven airbag deployment system. READY WHEN YOU NEED IT: Keep your vest functioning at its best—these cartridges are tested for fast inflation so you’re covered when it matters most. AUTHENTIC & TRUSTED: Manufactured by Hit-Air for precise fit and function—don’t risk your safety with off-brand replacements. Stay protected and prepared with this 3-pack of genuine Hit-Air 50cc CO₂ replacement cartridges, designed specifically for Hit-Air motorcycle and equestrian airbag vests. Each cartridge comes pre-filled, entirely metal-sealed, and sealed for single use, providing immediate inflation upon activation to help absorb impact during a fall or collision. Once the CO₂ has been punctured, the vest inflates immediately. These cartridges are compatible with a range of Hit-Air models, including all sizes of HDS and MX9, MLV and MLV2 in size Small, MLV3 in X-Small and Small, VHR in Small and Medium, ST in Small, VH in Small and Medium, and H2 in X-Small through Medium. If you're unsure about your vest's compatibility, we recommend contacting us before purchase. Installation is quick and straightforward—just screw the cartridge in by hand until secure. No special tools are needed beyond the Allen wrench and setting screw included with the vest, and replacements are available separately if needed. The installation toolkit is reusable, offering convenience for multiple uses. Once installed, the cartridge remains safely sealed and will only discharge when the vest's key ball mechanism is released, preventing accidental inflation. After activation, a puncture hole at the threaded end will indicate that the cartridge has been used and should be replaced. These cartridges are tested for reliable use in all weather conditions, including cold temperatures. While extreme weather may slightly affect inflation time, performance remains effective when the vest is properly connected. For best results, ensure that the connector spacing is correct and clean before use. With proper storage in a cool, dry environment—such as inside your motorcycle vest—the cartridges maintain their integrity for years. Although they don’t have a formal expiration date, it’s recommended to replace them after five years or sooner if you notice any rust, corrosion, or discoloration. Each 50cc cartridge weighs approximately 5.44 oz and includes instructions for use, though a separate storage case is not included. These cartridges are not refillable. They may be recyclable through your local collection center—please check your area’s guidelines. For best results and guaranteed safety, always use official Hit-Air cartridges rather than off-brand alternatives.