Features: 1. This auto-top-off system is easy to install on to your aquarium sump2. Float valve for manual adjustment, no other tool, no metal screws, no corrosion3. Comes with a O-ring, can meet 16/12 water tube, dont leak4. It is suitable for the aquarium which is under 15mm thickness. The adjustable range of water level is 0.5-15cm5. The bracket is made of material, stable and heavy enough, not easily knockedSpecifications:Condition: 100% NewType: Aquarium Auto Water ControllerMaterial: Acrylic + Plastic Color: As Pictures ShownSize: As the picture shownPackage Include: 1PC * Water FillerNotice:Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.Please understand that colors may exist chromatic aberration as the different placement of pictures.