This Magnetrol Kotron XA15-1G3B-KOE Displacer Switch is in unused condition and is guaranteed to be functional. We will be happy to provide additional information as well as photos so please feel free to contact us with any questions. Flange measures 7.5" outside, bolt to bolt 6" on center , inner raised flange 5" wide, cone is 3" wide by 2" high Single Stage displacer switches utilize one electrical control mechanism and are factory calibrated. Series A10 are wide differential units calibrated to actuate as a liquid level reaches a given displacer and to deactuate when the level reaches a second displacer. The minimum differential band is approximately 6 inches (152 mm) in water and varies somewhat with liquid specific gravity. The maximum differential is determined by the length of the displacer suspension cable The operating level is fully adjustable simply by repositioning the displacer along its suspension cable. The differential band varies slightly with liquid specific gravity Operation is based upon simple buoyancy, whereby a spring is loaded with weighted displacers which are heavier than the liquid. Immersion of the displacers in the liquid results in buoyancy force changing to net force acting on the spring. The spring compresses as the buoyancy force increases. A magnetic sleeve is connected to the spring and operates within a non-magnetic barrier tube. Spring movement causes the magnetic sleeve to move into the field of a pivoted magnet, actuating a switch mechanism located outside the barrier tube. Built-in limit stops prevent over stroking of the spring, under level surge conditions