Product Details: The Bendix QR-1C Series 3/8-18" NPT Supply Port Air Brake Quick Release Valve is high quality, durable valve designed to provide reliable performance and extended lifespan. This valve 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. This valve also comes with optional noise reducing foam crossers or silencers for added convenience. With its reliable performance and durable construction, it is the perfect choice for any air brake system. FleetPride is your First Click in Heavy Duty®.