Easy to install and operate Clips directly onto the edge of your aquarium tub for quick setup. Simple mechanical design makes it straightforward to use during routine maintenance. What it does and why you need it Designed to fill aquarium tanks and help maintain a stable water level, supporting a healthier environment for fish. Fully automatic start and stop: the unit initiates and halts water flow without electrical power, making small top-ups and incremental refills effortless and safe. Key attributes Adjustable shaft: metal construction with an adjustable length to suit different tank edges and positions. Important: the shaft is not suitable for use in water or seawater. Acrylic components (Acryl) are included in the design. Attaches to standard aquarium tubs; portable and easy to reposition. Practical use scenarios Topping up evaporated water between full changes to keep water level stable and reduce stress on fish. Partial water changes during routine cleaning: use the filler to add replacement water automatically after draining. Maintaining water level in planted or breeding tanks where consistent depth is important. Notes for safe use Confirm the metal shaft is kept out of continuous contact with aquarium water since it is not suitable for water or seawater. Use the adjustable mounting to ensure a secure fit on your tank edge before operation. This device offers a straightforward, power-free way to refill aquariums and support a healthier aquatic environment.