This heater wraps around the bottle to warm the bottle to maintain optimal bottle pressure automatically. Bottle pressure is key in a well performing nitrous system, and helps keep a consistent flow of nitrous pass after pass. This bottle heater includes a adjustable bottle pressure switch that automatically activates the bottle heater as needed to maintain the inputted bottle pressure (750-1200 PSI). Our bottle heaters have been tested, refined, and tested again to assure perfect fitment on 10, 12, & 15lb nitrous bottles of all brands. This bottle heater will fit all brand nitrous bottles and is easily installed and removed with velcro straps.