Description: Smooth: This aquarium slow flow outlet is designed to make the water flow smoother, reduce the impact of water flow on fish, and ensure their secure and comfortPrevent siphon: The duckbill outlet design effectively prevents siphoning, providing additional protection for your aquatic lifeFeatures: The fishes tank slow flow outlet set function helps to effectively remove the oil film on the water surface, keeping the aquarium clean and clearFunction:Duckbill outlet kits has a wave making bottom blowing function, which can increase the activity level of water, helping fish to be healthier and happierNoise reduction: This flute shaped outlet kits adopts a noise reduction design to minimize noise interference, making your aquarium quieter and creating a more peace Specification: Material: Acrylic Size Chart: 25cmx25cmx45cm/9.84inchx9.84inchx17.72inch,Inner Diameter:25cm/9.84inch Package Includes: 1 Fishes Tank Slow Flow Outlet Note: Please allow slightly errors 1-2cm differences due to manual measurement.