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Boyu WM-Series Flow Pump (WaveMaker) Features: Patented impeller structure: slow flow and turbulent flow, which solves the defects of common pump flow mode and flow rate too fast. For you to create marine life - a natural and ecological environment. Swivel angle adjustment, implemented in any suitable direction of water flow, handsome in appearance-power low-flow side large variety of installations allows the user to use;                                                   Model         Model          Suitable Aquarium  Size  WM-101   7W 20-120L            85x78x84mm WM-15    16.5W  80-350L     113x108x110mm WM-1  28W  40-300L  113x108x110mm WM-2  18W   40-260L  113x108x110mm WM-3 4x28W 100-600L 113x108x110mm