The Hammar lifejacket inflator safeguards you against unexpected inflation with a hydrostatic valve. This is just one of its many advantages! It has a hydrostatic safety valve It protects the gas bottle from corrosion It's fully disposable It needs no maintenance Fast inflation even at low temperature It's easy to re-arm It's easily checked It's small and light in weight It converts easily to a manual version There are two models of the Hammar M1A1 Inflator, a Manual and a Manual/Automatic version. Both are compatible so that you can upgrade from a Manual to a Manual/Automatic and vice versa in minutes if you wish. Some big benefits of the Hammar® Manual/Automatic Lifejacket Inflator Unique hydrostatic valve that protects the water sensitive element. No activation in rain, spray, splash or humidity. Gas cylinder located inside the lifejacket bladder. Cylinder protected against corrosion. Reduces snagging hazard No service requirement of the Inflator for 5 years.