Equip your semi truck to be Ready for the Road Ahead , with the Bendix 12V Heater & Thermostat Kit, a key component that optimizes the temperature of compressed air in a brake system. With a built-in heater and thermostat, this device works to regulate the temperature of the air passing through the air dryer to reduce humidity. Manufactured with ultra-durable components to tolerate daily wear and tear. FleetPride is your First Click in Heavy Duty .