Prepare your semi to be Ready for the Road Ahead , with the Bendix D-2A Non-Adjustable Air Compressor Governor Valve that provides enhanced air pressure control. To guarantee safe operation within pre-determined limits, this replacement valve works to help regulate the air pressure levels in a pneumatic system. Fashioned with top-tier materials to tolerate extreme pressures while making adjustments as needed. FleetPride is your First Click in Heavy Duty .