The Heidra 300 hydraulic submersible pump is a self-contained, hydraulic-powered 12" (300 mm) submersible pump with a diesel-driven hydraulic power unit available for heavy duty municipal and industrial dewatering and solids handling pumping applications. A variable displacement hydraulic piston pump on the power pack delivers hydraulic fluid to a fixed displacement piston motor that drives the pumpend’s shaft, bearings and cast steel impeller. Simple engine throttle adjustments allow changes to pump flow and head performance.