The operating principle provides for magnetic switch action resulting form a change in liquid level, which moves a magnetic Attraction Sleeve into the field of an externally located magnet. The illustrations given indicate the operating principle using a Float or Displacer to provide the operating motion. A falling level causes a downward movement of a magnetic Attraction Sleeve moving it below the magnetic field generated by the externally mounted alnico magnet. The bias spring then causes the magnet to pull
away from Enclosing tube in turn actuating the Switch. The reverse function takes place on rising level with the Attraction Sleeve being moved into the field causing the magnet to pull in towards the Enclosing tube, in turn actuating the Switch.