3 in 1 Function: Dirt suction. Aquarium gravel vacuum cleaner equipped with a duckbill suction inlet attachment, and it is easy to suck up the excrement. Sand wash. Aquarium siphon with 3D filter net, protect your loving fish and small gravel from aquarium suction. Water change. Built-in dual airbags, atmospheric cavity, good resilience, effortless operation. Working principle: Manual compressed air. The improved part is equipped with a handle, which has more operation space and saves labor and convenience, testing the fastest speed is to press 7 times. The sand washer has 2 thickened inflatable cushions inside, which can pump water quickly. And using ABS PP materials, extrusion resistance, dont worry about airbag damage and leakage. Easy to use: Press the siphon switch repeatedly of the aquarium siphon vacuum cleaner, make sure the inlet tube part is full of water. After the water flows out continuously, you can stop pushing and observe whether it will automatically. If not, keep running until the water runs out quickly and automatically. The sand can move up and down the extension tube to remove debris from your aquarium. Accessories Include: 1 * Air Pressure Control Body; 2 * extension inlet tube; 1 * extension tube connector; 1 * user manual; 1 * duckbill suction inlet (debris vacuum); 1 * outlet pipe (79 inch PVC pipe), water pipe can be cut as per request; 1 * water flow clamp (flow control), easily adjust the water flow; 1 * Fixing Clamp (Water Hose Clamp), fix freely, free your hands. Wide Application: The aquarium vacuum gravel cleaner is suitable for different kinds of fish tanks, with spliced extension tubes, two-stage splicing combination, large and small tanks are suitable, and extension tube can be installed according to demand.Four basic combinations (excluding handle length) : 2 tubes (31.4 inches); 2 tubes + head (34 inches); 1 tube (16 inches); 1 tube + head accessories (18 inches). The principle of this sand cleaner is gravity. The water outlet must be at least 19 inches lower than the water inlet when using this gravel cleaner. Due to manual measurement and length conversion, there may be an error of 0.1-0.5 inch is allowed, please in kind prevail. Due to the different strength of each person, size and depth of aquarium water, it there is no clear flow rate. Please refer to the actual operation. When washing sand: If your fish tank filter is powerful, you can put the outlet pipe into the fish tank, and the sand will flow into the tank without draining the tank. water. Otherwise, it is recommended to remove the cloudy water directly from the tank and change the clean water.