Corroder Air Line Throttle Controls are Designed to Control the Engine Speed of Gasoline and Diesel Engine Driven Compressors. The Air Line Throttle Control Keeps the Engine at the Operation Speed Until It Receives a Pressure Signal from the Pilot Valve, It Then Throttles Down the Engine Until the Pressure Signal is Released. Throttle Controls Must be Used in Conjunction With a Pilot Valve Which Controls the Pressure Signal. Air Line Throttle Controls Are Mounted Directly on the Engine and An Air Line is Run From the Pilot to the Throttle Control.