There are two spring in the controller for and accurate The pressure threshold can be adjusted through the well pumps pressure switches It is make of Brass with highly strength and durability This is a water pumps pressures control switches for perfect pressures control The pumps pressure can be adjusted by this switches, you can set the adaptive pressure according to the work needs Standard well pumps replacement switches, designed for all types of electric well pumps Easy to use: water pressures control is easy to use, stable, motor protections, long terms use, Manufacturer: Zeizafa