Multi Purpose---This aquarium water changer not only can change water, but also can clean up small gravel and remove excrement at ease. Qualitative Materials---The soft long pipe of this aquarium water changer is made of PVC, which is eco-friendly, non-toxic and flexible. Easy to Use---This aquarium water changer is easy to use, you just need to put the tube head immersed into the water and move up and down to produce pressure in the tube, then the water will automatically through the pipe due to the siphon effect. Special Tube Head Design---This aquarium water changer adopts special tube head design, makes it more convenient than other products to change the water at the aquarium manually. Suitable for Small Sized Aquarium---This aquarium water changer is mainly suitable for family small sized aquarium or fish tank.