All of the Cold Fire Defense aerosol is pressurized and filled with a -50 degree F charge of Cold Fire. Being non toxic, non corrosive, and eco friendly, Cold Fire Defense is the best option for suppressing fires and creating a unique heat barrier for trapped car fire victims. Traditional extinguishers can't touch the effectiveness of Cold Fire Defense. Groups can save money by refilling these units themselves with the ease of the built in schrader valve on each extinguishing unit, besides the aerosol of course. Simply repressurize with compressed air after the unit has been refilled to its proper weight.