VEVOR 1" x 11" Well Pressure Tank Tee Kit, with 40/60PSI Switch, 7-Pieces Pure Brass Pressure Tank Installation Kit for Water Well, Fit Most Tanks with Diameters up to 16 Inches
The opening or closing of this product is related to pressure, for example, a 40-60PSI switch will start working when the water pressure reaches 40PSI. If there is no pressure in the pipeline, it will not operate.