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 AquariumSize WM-1017W20-120L 85x78x84mm WM-15 16.5W80-350L 113x108x110mm WM-128W40-300L113x108x110mm WM-218W40-260L113x108x110mm WM-34x28W100-600L113x108x110mm