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https://www.mcmaster.com/product/9382T87/
9382T87 | Heavy-Duty Sewage Water Float Switch for Sump Pump
Activate your pump in dirty water that contains sludge and sewage.
water float switchheavy dutysewagesumppump
https://www.mcmaster.com/products/49175K38/
49175K38 | Horizontal-Mount Float Switch for Water
Mount these switches through an unthreaded hole in your tank wall and secure with a nut from outside the tank.
float switchhorizontalmountwater