Originally Posted by SeaDog
My flagstaff (not a wildcat) has that same opening its where the water pump and filter are located.
Thanks for the quick reply. I assume it is a door for access? That area is under our sink and nothing but storage, no pump there. Maybe it's storage access from the outside or possibly they relocated the pump on the later '16's?
Edit: Just found a youtube video of one like it, and it is the water heater. Ours is on the side. So, they moved that for whatever reason.