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Since it is in the very back of the unit, I'm guessing it is the fresh water tank drain but I've never seen a petcock on the end of them. Normally just a tube hanging down with a cap on the end. I like the idea and may just have to modify mine so I can drain the tank from the side of the unit. The additions to the units is never ending. It looks to me the residential frig drain which is also the second blue line coming down from the belly is up a little further closer to the axle.
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