Quiet and Water‑proof: The design of back pressure stop + press buckle instead of sealing makes it quiet and water‑proof to Use: The fish for tank water filler is easy to use, better than a float for no wiring or power supply is required, and it takes up less space The water has a side hole design, which can effectively air generated by back pressure Automatic Replenisher Water: You don'for t need to replenisher water frequently, it will automatically replenisher water when the water drops to reveal a shorter tube Function: When traveling on business or traveling, use the automatic water compensation device to avoid water shortage in the fish for tank and aquarium