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The Basement Watchdog Dual Float Sump Pump Switch with Controller activates your sump pump using a large, protective case-enclosed float that detects a 1/4 in. water level rise. The second float acts as a failsafe that activates your sump pump in the event that the first float does not, helping ensure that your pump drains effectively. Both floats drop easily as your pump runs for an additional 10 seconds to drain excess water, making sump water level maintenance easy.