The float switch is a switch that regulates the level of the barrel - tank or well. It can be automatically adjusted - easy to operate - easy to install - safe and reliable - no maintenance - non-toxic recycling renewable environmental float switch, water supply control and drainage control. It has a resistance to sewage, widely used in the home - factories and mines, such as the pool - oil - acid and alkali pool - bucket - tank tank, etc. If you have two controllers. One to the water tower, and the other to the well control pump, can prevent the water shortage due to the empty pump damage pump equipment; Three controllers can also be connected in series. One can be discharged to the water tower, the other to the filter and the other to the river water (well). Three controllers can also be connected in series, and one can be put into the water (well) to control two pump equipment simultaneously