The PrimaTech Air Conditioner Switch is the perfect solution for preventing compressor operation if your system has a refrigerant loss or the ambient temperature drops too low. It automatically resets when the pressure drops to normal, ensuring your air conditioner is always running at peak performance. This switch is designed to fit Freightliner business class applications and features a 12V voltage and a female M10-1.25 mm fitting thread size. FleetPride is your First Click in Heavy Duty®.