... protecting controller device, against under-voltage, over-voltage,over-flow, overload, waterless , automatic recovery ,controlling water height ... submersible motor, graphite bearings.Application: Water irrigation, high efficiency of increasingoxygen on aquaculture, pumping water from ... close to the rated head and must be immersed in water. NEWSKY Noiseless Screw Low Flow High Head 3SPS DC Solar Water ...