Description: 【Efficient】Pouring Diffuser Effectively controls water flow by gently diffusing rapid streams, preventing disturbance and maintaining a calm aquatic environment. 【Material】Crafted from pp and silicone materials for long time use, ensuring stable water volume control and supporting a balanced aquarium ecosystem 【Protective Fish】Water Flow Controller Safeguards fish and aquatic plants from strong currents, creating a habitat for all tank inhabitants. 【Convenient】Securely holds gravel, plants, and decorations in place during water changes, eliminating the hassle of rearranging your aquarium setup afterward. 【Efficient Water Change Process】Enhances water change efficiency by regulating flow rate, reducing debris disruption risk, and making aquarium maintenance smoother Size Chart: 16cm/6.30inch Package Includes: 1 Fish tank water flow controller Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.