Description: This water changer makes use of siphon effect, with it you can change water in the tank, remove excrement and gravel effortless. You don't need to spoon up water any more, suitable for small sized aquarium. Features: Special tube head design makes it easy to change the water at the aquarium manually. Put the tube head immersed into the water, move up and down to produce pressure in the tube, then the water will automatically flow through the pipe due to the siphon effect. The soft long pipe is made of PVC, eco-friendly, non-toxic and flexible. Suitable for small sized aquarium. To change water, clean up small gravel and remove excrement at ease. Specifications: Condition: 100% Brand New Material: PVC Color: as Shown in the Picture Fit for : About 30L Small Fish Tank Tube Head(L x Diam.): approx. 17.4 x 2.8cm / 6.85 x 1.10in Long Pipe Length: approx. 150cm / 59.06in Weight: approx. 88g Package Included: 1 x Long Pipe 1 x Tube Head Steps: 1. Put the tube head immersed into the water. 2. Move up and down to produce pressure in the tube. 3. The water will automatically flow through the pipe due to the siphon effect. .