Description: 【Anti Suction Design】This aquarium filter protection box is designed to prevent fish or sand from being sucked into the water pump, ensuring a peaceful environment for your aquatic pets. 【Easy Installation】This Fish tank water protector comes in a set that can be easily installed in your fish tank without any professional help needed. 【Material】The aquarium pump protective cover is made of sturdy material, suitable for saltwater or freshwater system. 【Reasonable design】The top is equipped with a water pump power cord hole and a water pump outlet hole, and the bottom is designed with heightend suction cups feet to block the mud and sand. 【Sizes】Small pond filter filter box with two sizes to choose from, you can choose according to your needs. External dimensions - Small: 11.5cmx7cmx8cm, water pump outlet hole diameter is 18mm. Large: 15cmx9cmx10.5cm, water pump outlet hole diameter is 24mm. Please measure the size before purchasing. Specification: Material: ABS Size Chart: Large: 15cmx9cmx10.5cm, water pump outlet hole diameter: 24mm. Or Small: 11.5cmx7cmx8cm, water pump outlet hole diameter: 18mm. Package Includes: 1 Set Aquarium Pump Case (Small or large) Note: Please allow slightly errors 1-2cm differences due to manual measurement.