Atmos 40 & Arcus 40 Re-Arming KitThe RK-40 Re-Arm Kit, with a 38-gram CO2 cylinder, is compatible with all Bluestorm® Atmos40 and Arcus40 life jackets. The Bluestorm® RK-40 contains all the parts you need to easily re-arm your life jacket and get back on the water quickly. All Bluestorm® inflatable life jackets feature an internal pocket to store a spare cylinder, just in case you need it. So remember to pick up an extra kit for your life jacket.Includes:38 gram CO2 cylinder with 1\/2” threadHalkey-Roberts V80040 Yellow BobbinRearming instructions