How It Works: Float valve for manual adjustment, no other tool, no metal screws, no .When the water level is low, the float ball opens the valve downward to allow water to into the reservoir. When the water level is high, the float ball drives the valve upward and closes the valve so that water can no longer into the fish tank. Convenient to Install: This auto-top-off system is easy to install on to your aquarium sump.Comes with a O-ring, can meet 16/12 water tube, and the water will not leak.Float valves are used to shut down your reverse osmosis system when the float is elevated,It automatically start and stop water flow. Scope of Application: Our Auto water controller is suitable for the aquarium which is under 15mm thickness. The adjustable range of water level is 0.5-15cm.The float is adjustable to allow you to control the water height. Premium Plastic and Acrylic: This Auto water filler is made of high quality acrylic and plastic, which is stable and durable, not easily knocked, the smooth will make it a easy work to clean it. Specification:
Item Type: Aquarium Auto Water Controller
Material: Acrylic + Plastic
Item Color: As Pictures Shown
Valve Size: Approx. 4 x 5.6 cm / 1.6 x 2.2 inch
Package Weight: Approx. 66 g

Package Included:
1 * Water Filler
3 * Accessory
1 * Bracket

Notice:
Please allow 1-2 cm error due to manual measurement. Please make sure you do not mind before you bid.