Update your semi with a rapid release of its air brake pressure, with the Bendix QRN™ Series 1 psi Open Exhaust Quick Release Valve that ensures you're Ready for the Road Ahead™. Due to its sophisticated design, this replacement valve is able to quickly release compressed air from the brake chambers into the brake shoes, allowing vehicles and trailers to stop or slow as needed. Constructed with top-tier materials to tolerate extreme conditions. FleetPride is your First Click in Heavy Duty®.