【5 in 1 Function】 Water Changing:Built-in dual airbags, atmospheric cavity, good resilience, effortless operation.Sand Washing and Raking: Aquarium siphon with 3D Filter Basket Net, protect your love fish and small gravel from suck out of the aquarium.Dirt Suction:Gravel Vacuum for Aquarium equipped with a duckbill suction inlet accessory, and it is easy to suck the feces away.Fish Tank Glass Scraping:Clean up algae and stains on the fish tank.Sand Raking 【Easy to Use】Push the siphon switch several times, you can stop push after the inlet tube part is full of water and water continuously flows out from the outlet hose.Observe whether it will automatically.If not, please continue to operate it until the water flow out automatically.The small debris will be removed by the current.Please note that the water outlet must lower at least 20 inch than the inlet when using. 【Wide Application】The kit is equipped with two 15.7-inch inlet tubes. The installation length can be selected according to the height of the fish tank. it is easy to install and operate. fitting different-sized fish tank.