I agree that it looks like a snap type thermostat but there may be other methods to help ID the item.
One is to look for a pipe in the area and see if it has just came unsnapped off the pipe. Maybe a 1/2 inch copper pipe?
Another is to look at the yellow RVwiring and see if there is an ID stamped along the sides of the wires.
This first snip gives and example of what you might find, and then if you have the code, go to this site for the "magic decoder" list!
https://www.winnebago.com/Files/File...ical_guide.pdf
Secret to ease of use on the list is to bring it onscreen, hit "ctrl and F" to bring a search box, input the code and it brings a list of where that code is found in the list, so scroll through the potential spots until finding the "from and to" that fits your item?
But that assumes several things like the code is there and still legible, etc but still easier than crawling all around the RV in a bug hunt when somebody may have just added the item for some unknown personal use.
Maybe they liked their beer slightly warmed?