The Stearns Inflatable Life Jacket Rearming Kit is for re-inflating PFD models 4441, 4442, and HRV1136. Contains three 16 g CO2 cylinders and three red safety clips. Inflatable life jackets have come a long way. It is a lifesaving device that you can rig to inflate automatically when the life jacket hits the water, or you can set up the inflatable lifejackets to manually trigger with the pull of a tab. Inflatable lifejackets give peace of mind, are simple to re-arm with a little practice, and can be comfortable to wear.