【WIDE APPLICATION】The aquarium water adding device can be used to replenish fresh water in fish tanks and improve fish living environment, creating a great deal of bubbles that your fish loves. The fish tank water changer features fully automatic start and stopping, no electricity is needed. 【VARIOUS INSTALLATION】The ATO system is easy to hang on to your aquarium sump. The unique double hanging device can be directly hung on aquariums or fish tanks. The updated water level adjustment device, which enjoys a larger rotation range, replaces the original bracket adjustment, and the aquarium water changer can be applied to water level range from 0.5 to 15 cm. 【FLOAT VALVE】The unique float valve: the adjustment shaft adopts engineering plastic instead of metal screw, and you don’t need to worry about corrosion. You can adjust the ideal angle by hands and no extra tool. Furthermore, the multi-purpose bracket can fix water replenisher firmly. The water level controller can work with water purifier and normal water bucket, a superior supply for both fish tanks and aquarium.