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Does anyone know how the automatic "water sensing" works in these pumps? The Rule pumps turn on every 2 1/2 minutes and check for impeller resistance and run until the water is pumped out. Anyone know how the Ridgid ones work?
I couldnt find any reference to the inner workings of the pump on the internet. However it could be turned on by two metal probes that create a closed circuit when water contacts it. It would then turn off when water falls below the contacts. Amp draw circuitry is somewhat expensive. IMO, probably too expensive for a $139 pump.
... it was plumbed by Ray Charles and his helper Stevie Wonder