Automatic Aquarium Water Refill Tool with Coke Bottle Adapter

Automatic Water Refiller for Aquariums This automatic water filling tool keeps your aquarium topped up without constant attention. Designed for tanks with glass walls up to 8mm thick, it works with standard domestic cola bottles to create a simple, self-regulating water supply. The device uses a differential pressure system to maintain a consistent water level, making it a practical addition to any freshwater or tropical setup. Simple Pressure-Based Operation The refiller works by balancing air pressure between the bottle and the aquarium. It comes with two states to suit different tank walls: one for 5mm glass and another for 6mm glass. A differential pressure pipe, with an angled water intake, is supplied in two lengths. The shorter pipe determines the maximum water line. When the short tube is fully exposed above the surface, the device refills the tank; once the water covers the tube again, the flow stops automatically. This cycle repeats as needed, keeping the level steady. Flexible Hose and Bottle Compatibility The hose is supplied longer than needed and can be trimmed by hand, so you can adjust the reach to suit your tank layout. The unit is threaded to fit standard domestic cola bottles, which act as the water reservoir. You will need to supply your own bottle, but this makes replacement simple and inexpensive. The fitting is compatible with internationally standard cola bottle necks, so most common brands will work without issue. Easy to Set Up and Maintain There are no pumps or electrical connections involved, which keeps installation straightforward and running costs negligible. Simply attach the device to the aquarium wall, fit your chosen bottle, and let the pressure system take over. The manual hose adjustment also makes it easy to position the intake exactly where you need it, whether you are topping up a display tank or a quarantine setup.