The Airsource 12V 24" Capillary Tube Thermostatic Switch is designed to provide reliable temperature control for Navistar trucks. This thermostatic switch features a capillary tube for accurate temperature readings. It is designed to provide reliable temperature control and is easy to install. This switch is perfect for keeping your truck running at the optimal temperature. It is durable and reliable, ensuring your vehicle stays running at the right temperature. FleetPride is your First Click in Heavy Duty®.