TRIPLAIR is an open-circuit insulating respiratory system that provides long duration autonomy ( 60 minutes ) using a cylinder unit holding 3 compressed air cylinders with a capacity of 3 litres at 300 bar each (i.e., a total of 9 litres at 300 bar) protected in an anatomical ABS backpack .Specially develop and designed for the French Navy it allows the wearer to pass thru very narrow passageways and gallery.