The Onyx Outdoor M-33 33 Gram Rearming Kit is a convenient tool for keeping life jackets and vests in top operating function. When the chamber is inflated by CO2 cylinder, the rearming kit is required. Each inflatable flotation devise comes with instructions on how to replace. This Onyx Outdoor kit includes 33 gram CO2 cylinder with Halkey-Roberts bayonet assembly, water soluble bobbin, and fits A-33 In-Sight automatic inflatable life jackets (#1334, #1335).