UNITED MOULDERS SPARES The United Moulders (UM) lifejacket inflator uses a screw on cartridge and activates when it comes into contact with water. The cartridge mechanism has a compressed high powered spring which is held by a paper element. When the paper element dissolves it releases the spring which allows the firing mechanism to puncture the CO2 cylinder, the CO2 t hen t ravels t hrough t he m anifold a nd i nflates thelifejacket. The automatic system is backed up by a manual override, which allows the user to pull the toggle and inflate the lifejacket.