... -free 4.Non-Pollution Noiseless NEWSKY 3SPS DC Solar Power Water PumpFeature:1. Compact structure, high-lift, noiseless, non-pollution, ... voltage, over-voltage,over-flow, overload, waterless , automatic recovery ,controlling water height as demand.2. Easy installation, maintenance-free, safe and ... .5-8.5. 3.Work close to the rated head and must be immersed in water. NEWSKY Noiseless Screw Low Flow High ...