The Hydrostatic Inflator Technology – HIT re-arm kit contains everything necessary to re-arm (by replacing) your Mustang Survival HIT inflator after deployment. For model numbers: MD0450. Use only Mustang Survival Re-Arm kits. Use of other re-arm kits may result in improper operation or failure to operate and will void the product’s warranty.Re-arm kit contains:Auto hydrostatic inflator Cap Body38 gram CO2 cylinderMetal keyRe-arming instruction manual* Product expiration dates may vary -Proposition 65 WARNING for California residentsFEATURESIncludes auto hydrostatic inflatorCapBody38 gram CO2 cylinderMetal keyRe-arming instruction manual