Product Features: This product is easy to install and use. Press design, the product can move to the fish excrement and dirt in the aquarium. Can be used as a water siphon, let suck the water out of the aquarium. Detachable suction pipe design, suitable for aquariums of different sizes. Assembly Step 1: Installation valve: prevent air leakage 2: Connected water pipe interface 3: Connected fresh water pipe 4: Connected 3D filter net: protects fish and small gravel from being sucked out of the aquarium 5: Connect the pump: can extend the length of the pipe; nice by connecting additional pipes 6: Press the air pressure button until the water comes out