The Bendix QR-L Series 3/8-18" NPT Supply Port Air Brake Quick Release Valve is designed to provide maximum efficiency and reliability in air brake systems. This valve is rigorously tested to ensure it meets the highest standards of quality and performance. It is made of high quality durable material for an extended lifespan. The valve also comes with optional noise reducing foam crossers or silencers to reduce noise levels. This valve is ideal for use in commercial vehicles, buses and other heavy duty applications. FleetPride is your First Click in Heavy Duty®.