Product Details: The Bendix QRN Series 3/8-18" NPT Supply Port Air Brake Quick Release Valve is high quality, durable valve designed to provide precise control of air pressure in air brake systems. This valve is made of a durable material that ensures an extended lifespan and is designed to deliver within 1 psi of control pressure to the controlled device in the standard configuration. It consists of one exhaust port, two delivery ports and one supply port. Additionally, this valve comes with optional noise reducing foam crossers or silencers for added convenience. FleetPride is your First Click in Heavy Duty®.