uxcell Float Switch Liquid Water Level Sensor Water Pump Tank for Swimming Pools Gardens Pond M11 9.5 inches (240 mm) Length

It works well. Decent materials and finish, performance is as expected.

You can reverse the on/off by flipping the float over on the rod.

La calidad del material es muy buena, lo usaré para controlar una bomba de achique. Por tanto lo usaré para controlar un nivel mínimo. Usaré el flotador para controlar un relevador, y este a la bomba. Gracias

la fattura

I'm very impressed with the apparent quality of these switches. They are beautifully made and work properly as received. Only time will tell if they are reliable and remain free of corrosion. I purchased two of these to use as level control switches in cattle watering tanks. I mounted them inside 1-1/2" PVC pipes to act as stilling wells and to provide protection from big, curious animals. I use these to operate relays that turn the water supply pumps on and off. Previously, I used float valves, but they leaked and wasted water in a solar powered watering system that needs to be efficient. Now the pumps turn on and off based on tank level, and not back-pressure from leaky float valves. The pumps don't run as often, and they operate against very little back pressure, since no valves are involved in the system any longer. Less water is wasted and less solar/battery power is used.