The Bendix PR-4™ Series Air Brake Pressure Protection Valve is designed to help ensure that your brakes are always working at their best. This valve is designed to maintain a consistent closing pressure of 70 ± 5 PSI, ensuring that your brakes are always working at their optimal level. It also helps to ensure safe and reliable braking even in harsh weather conditions. The valve comes with a supply port and delivery port of 1/4-18 NPT each, making it easy to install and use. FleetPride is your First Click in Heavy Duty®.