OTR Spool Assembly #10 MV-3 Manifold Dash Valve ensures Expertise Built In being designed to enhance vehicle performance, consisting of a valve body, plungers, and spools. These brake valves are engineered for easy installation due to it being housed in a single body containing dual circuit supply through a double valve check. Receiving air supply from whichever service reservoir is at higher pressure, you will have the same form, fit and function as OEMs and major brands. FleetPride is your First Click in Heavy Duty .