The electromechanical devices operate with a float containing a permanent magnet riding on the surface of a liquid. A stem containing a reed switch is actuated by the magnet and guides the float motion. Switches come in brass, stainless-steel, and plastic models.
Whitman Controls Corp., 201 Dolphin Rd., Bristol, CT 06010, (800) 233-4401, whitmancontrols.com
