Tired of trying to keep your car's bottle pressure in the Sweet Spot? Then the Fire & Ice Pressure Controller is the solution for you. This microprocessor-controlled unit keeps bottle pressure correct even in the most demanding conditions. Space-age circuitry enables the solid-state heating and cooling unit to maintain nitrous pressure within 5 psi. If ambient temperatures cause bottle pressure to escalate, the unit engages the cooling mode to lower pressure to a preset level. If ambient temperatures cause pressure to decrease, the unit engages the heating mode to achieve the same preset level.