Specification: Item Type: Aquarium Auto Water Controller Material: Acrylic+Plastic Item Color: As the pictures shown Float Valve Size: approx. 4 x 5.6cm / 1.6 x 2.2inch Package Weight: Approx. 66g 【EASY INSTALLATION】:This auto-top-off system is easy to install on your aquarium sump 【EASY TO USE】Float valve for manual adjustment, no other tools, no metal screws, no corrosion 【PRODUCT PERFORMANCE】comes with o-ring, can meet 16/12 water tube, non-leaking 【APPLICABLE WATER TANK】It is suitable for the aquarium with thickness less than 15mm. The water level adjustment range is 0.5-15cm 【MATERIAL】The bracket is made of high quality material, which is stable and heavy enough, which is not easily hit