The Neptune Electric Stroke Control allows the capacity of any Neptune 500 Series, 600 Series, or 6000 Series Hydraulic Pump to be automatically controlled in response to a standard 4-20 mADC process signal. Alternate inputs are 0-5 VDC/0-10 VDC signal or incremental contact closures. The one-piece controller-positioner mounts directly to the pump. No machining or any special drillings or tapings are needed to retrofit the pump. Electric Stroke Control is commonly used in water/wastewater, power and process industry applications or anywhere pump flow must be automatically proportioned or varied.