Prepare your semi to be ready for the long haul, with the OTR 1/2"-3/8" 85 psi Pressure Protection Valve that provides safe air pressure levels with Expertise Built In™ to each part. By utilizing a sophisticated design, this replacement component is able monitor the internal pressure of the air brake system, preventing over pressurization by releasing air pressure once it exceeds a certain level. Built with innovative technology to reduce the chance of leaks and mechanical failures. FleetPride is your First Click in Heavy Duty®.