Easy to operate: The tank water filler is simple to use, easier than a float valve, with no wiring or power required and a compact footprint. Function: Use during business trips or travel to automatically compensate water in tanks and aquariums, helping to prevent water shortage while you are away. Design advantage: The water top-up features a side-hole design that effectively prevents air bubbles caused by back pressure. Automatic refill: No need to refill water frequently; it automatically replenishes water as needed. Compatibility and performance: Compact, space-saving unit suitable for tanks and aquariums; operates without electricity for reliable top-up wherever you go. Use scenarios: - On business trips or vacations to maintain water levels in tanks and aquariums without monitoring. - During extended absences in offices, hotels, or at home to keep tanks topped up with minimal maintenance. - In evaporation-prone aquariums to maintain a stable water level automatically.