i have seem some that work of off amperage. a pump pumping water will pull more amps than one that is dry. if the amps are low it will shut back down, if they are high, it will pump umtil the amp load drops.
i think you would be better off giving each pump its own outlet. if you are in a situation where you are having to use multiple bilge pumps, you probably want to get as much water out of the hull as possible. i think combining outlets would cut down on the capabilities of both pumps.
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