DC Solar Water Pump 1. GS, ROHS.CE.ISO9001:2000 2.Easy installation 3.Maintenance-free 4.Non-Pollution Noiseless NEWSKY ... overload, waterless , automatic recovery ,controlling water height as demand.2. Easy installation, maintenance-free, safe and reliable. Water depth :1-180m ... Max efficiency is over 85%,raise 25% than traditional AC pump.4. Material: 1)stainless steel casing, shaft core,coupling ...