What is the switch in Kitchen

[50kw]

I have just picked up a new 2006 Sun Voyager 8351. There is an 120 volt style electrical switch inside to the left of the sink. During the dealer check out they did not know for sure what it does. They think it has something to do with the water filter. I don't think so after reading about the filter.

Anyone have know what this switch is for?

Thanks