Product Details: Ensure your semi is Ready for the Road Ahead™ with enhanced air pressure control, with the Bendix D-2® Air Compressor Governor Valve. Thanks to its sophisticated design, this replacement valve is able to help regulate the air pressure levels in a pneumatic system to guarantee safe operation within pre-determined limits. Crafted with durable materials to endure extreme pressures while making adjustments as needed. FleetPride is your First Click in Heavy Duty®.