Prepare your semi to be Ready for the Road Ahead , with the Bendix ATR-6 Series 1/2-14" NPT 12V Traction Relay Valve that provides advanced braking and traction control. To provide advanced stopping power and reliability, this replacement valve remotely controls the rear air brakes of a vehicle, ensuring they operate in a timely fashion to increase safety and efficiency. Fashioned with a durable body that performs exceptionally well in high-pressure settings and temperatures ranging from -40 °F to 185 °F. FleetPride is your First Click in Heavy Duty .