Update your semi with safe air pressure levels, with the OTR WM778A Style 70 psi Pressure Protection Valve that ensures you're riding with Expertise Built In™ to each part. This replacement component works to monitor the internal pressure of the air brake system, preventing over pressurization by releasing air pressure once it exceeds a certain level. Engineered with innovative technology to reduce the chance of leaks and mechanical failures. FleetPride is your First Click in Heavy Duty®.