Kang&reg; DC40C-1240 12V Water Pump for Water Circulation Aquarium Submersible 720LPH 4M Brushless with no pollution, adopts high-performance ceramics shaft and high-precisioncarbon fiber sleeve together (stainless steel shaft optional for reducing cost long life span) Stator and control circuits are completely sealed by epoxy resin completely separated with rotor, waterproof, avoided water-leakage problem which long exists in normal DC motor pump products Protection functions can be customized such as lock protection, dry-run protection and so on.Reduced the mortality to 0.05% after long-time study by R&D Dep. Lift of pumps can be doubled when contact the pump in series.Can be installed submersible or outside water (should below water level),Offer ODM serve for pump and other controller system