I'm the owner of a new to me 2006 Cikira Classic Cruiser 18FD. I noticed under the sink in the bathroom there is a keyed switch for, labeled in marker, a grey water pump. I've never heard of such a thing and I don't hear anything when I turn it to the on position. Is anyone familiar with this in their RV? I just got the trailer this weekend and have yet to figure out what all the other two keyed switches up under the left side bench seat are for. I believe they're battery disconnect switches but why two of them? There's not much about these trailers on the web, well other than the typical people either love them or hate them that is. Any help is appreciated!