
This bilge pump can be manual only (only works when the switch is on) or automatic (which is always energized but only works when the internal float is up) or both . We connected it for both; The boat would have been left with the battery off, but the third wire always powered the pump - so if it was raining and enough water had accumulated in the hold, the float switch would turn the pump on. Unfortunately there was a problem with the float. Switch. Even when using the small extension handle to lift the float, he rarely powered the pump. This is unacceptable for a bilge pump, failure of which could easily result in a sunken boat. I have since purchased a replacement and have to return it for inspection/repair/replacement/refund at seller's option.

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