UMA 5000 (Baltic cartridge UM #2520), , Cartridge (trigger) United Moulders for inflatable life jackets. When you buy a new inflatable life jacket, it comes complete with CO2 cylinder and cartridge trigger, if your inflatable life jacket deploys, you need to reload it with a new gas cylinder and cartridge trigger., , How do I know which cartridge trigger fits my inflatable life jacket?, , Inside the life jacket on the inflatable lung, information is printed on which gas cylinder & cartridge fits your life jacket. For example USE ONLY BALTIC Cartridge UM # 2520