840 Electromechanical Float Switch, Industrial Low Operating Force, Type 4 Fiberglass Polyester Enclosure, 1NO / 1NC Contact, ForTank or Sump Operation 840-A4 FLOAT SWITCH
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link
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Spec Sheet
https://static.graybarcanada.com/Generic/11447_tl7gv0z9jw4ex63b.pdf