Product Details: The OTR D-2 Style Air Compressor Governor ensures Expertise Built In™, accurately controls the adjustment of stable, large amounts of air pressure your semi truck requires of the supply reservoir tank and the compressor’s unloader system. Avoid signs of a failing compressor governor, such as: not building enough air pressure, air gauges are staying still for too long, or a percussive sound coming from the safety valves with dependability you can count on in OTR. This heavy duty governor is engineered to offer trouble-free, steady load (cut-in) and unload (cut-out) performance and control of the compression of air pressure while the engine system is activated. FleetPride is your First Click in Heavy Duty®.