Inflatable life jackets can be reused after each inflation but the CO2 cylinder needs to be replaced before using again; use the Onyx M-24 Rearming Life Jacket Kit to keep yours ready. It is recommended to purchase an extra rearming kit to try out your inflatable life jacket and become familiar with its operation. Be sure your inflatable PFD is properly armed and ready to use before you head out on the water. Always read your Owners Manual for the proper way to initially arm your life jacket with the CO2 cartridge and how to rearm it after it has been inflated. Instructional videos available at Onyxoutdoor. com. Fits Onyx A/M-24 (automatic/manual) inflatable life jackets (1320, 1321). Fits Onyx manual inflatable life jackets M-24 Manual Inflatable PFD Belt Pack (Model #1300) M-24 Manual Inflatable PFD (Model #1310)