Product Details: The OTR Spring Brake Control Suspension Reservoir Service Brake Priority Valve ensures Expertise Built In™, having the required strength and innovation to properly supply air. This OTR service brake priority valve fills your reservoir and releases the spring brakes, simultaneously, after the internal pressure protection valve opens. This OTR reservoir service brake priority valve weighs approximately 2 lbs with a 1/2” reservoir port. As a result, this heavy duty priority valve supplies reliable and superior braking power. FleetPride is your First Click in Heavy Duty®.