Equip your semi for the long road ahead with the OTR 1/2"- 3/8" 55 psi Pressure Protection Valve, a sophisticated device that provides safe air pressure levels with Expertise Built In™ to each part. Due to its 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. Constructed with innovative technology to reduce the chance of leaks and mechanical failures. FleetPride is your First Click in Heavy Duty®.