SFS-050 monostats enables the electrical contact to close or deviate when the pressure difference between two inputs exceeds the set values; Opens or releases the ignition when the set point falls within the range. It can be used in plumbing systems when the pressure difference between two points is desired to exceed a certain value or to drop a certain value from the ground. The location of the classic O-ring and shaft is located in a pair of permanent places inside the pressure switch tank, one of which is stored in different positions relative to the other external parts. It greatly increases the durability and working life of the solution and its pressure.