Renovate your engine with essential parts with Expertise Built In™ to provide fast and reactive air brakes, with the OTR RE-6 Type Emergency Relay Valve. By positioning itself between the service reservoir and the rear air brakes, this replacement component is able to quickly release compressed air and actuate the air brakes. Built with a solid metal body to tolerate extreme pressures and daily use. FleetPride is your First Click in Heavy Duty®.