Product Details: Outfit your semi to be Ready for the Road Ahead™ with a rapid release of its air brake pressure, with the OTR QR-L Style Inline Quick Release Valve with Expertise Built In™. Thanks 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. Crafted with durable materials to tolerate extreme pressures. FleetPride is your First Click in Heavy Duty®.