ITEM NAME:Aquarium Water Filler Auto Water Filler Controller System Adjustable Float-Valve Features: 1. This auto-top-off system is easy to install on to your aquarium sump 2. Float valve for manual adjustment, no other tool, no metal screws, no corrosion 3. Comes with a O-ring, can meet 16/12 water tube, don't leak 4. It is suitable for the aquarium which is under 15mm thickness. The adjustable range of water level is 0.5-15cm 5. The bracket is made of high quality material, stable and heavy enough, not easily knocked Specifications:.It is suitable for the aquarium which is under 15mm thickness. The adjustable range of water level is 0.5-15cm. This auto-top-off system is easy to install on to your aquarium sump. The bracket is made of high quality material, stable and heavy enough, not easily knocked.