I'm in the same position as the OP. I just got mine a few weeks ago. The guy did a walk through when I took delivery but when I got to the campground a week later and went to drain I was clueless. I have two valves in the bay which I assume drains the upper bathroom. Then I have a valve behind the rear wheels (which is impossible to get to with slides open) Then I have two more drain line connections which I assume is rear bathroom and rear kitchen. I have a Montana Mountaineer 346LBQ with rear 1/2 bath and outside kitchen.
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