Since it is not lableled it may have been added. Perhaps a water pump switch.
There is one on our panel but it is labeled as such.
Our bathroom did NOT have a water pump switch inside that area. What a dumb thing and quite inconvenient at times. Even though there was one just outside on the wall.
I added a switch inside the bathroom that does not have a light on it but the other switches light up no matter where I turn the pump on from.
So see if it activates your water pump, even though the switch may not light up. The internal lights on those switches are not very good and I changed most of mine to led's.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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