Hey guys,it's an newest Automatic Water Level Control. If you lack of water in your tank,it will turn ON, and the water come in, if water is full, it will turn OFF, water does't come in,stop water overflow.That is not electronic activation,no need electric, super safe,super economic,super environmentally friendly. Feel free to ask me any questions in the comment area
![](https://i.ytimg.com/vi/X5-HrF13rPg/mqdefault.jpg)