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I see no responses to your posting so my 2 cents worth is that it looks like you have two low point pull style drain valves (hot and cold). My “guess” is that Thor used the standard and available pull valves and then needed a way to cap the hot valve on one side, since it clearly was not going to feed any hot water devices after the drain valve. Why they would not just cap it instead of using a threaded fitting might be just availability of the fittings they had on hand at the time. Not sure I would want to do any water draining or filling etc inside my coach, but then my water pump etc are all located in a wet bay with outside access.
Regarding the use of pink non toxic antifreeze in the fresh water tank; each to his own on this one. I use about 2 gallons of pink in my fresh tank every Fall, not because I am concerned about the fresh tank itself freezing up, but because I am concerned about the pex feed line (and shut off valve) from the fresh tank to the water pump freezing if any residual water is left in that line. Pink in the fresh tank feeding the pump is a simple way to do that. I do however have a suction line for pink antifreeze between the fresh tank and pump which I use for the bulk of the coach winterization process.......only because it is easier than pouring all the pink through a gravity feed port on the fresh tank. Lastly, for those concerned about pink in the fresh tank......where do you think all that pink sits through out the Winter.......in all the pex water lines in the coach that carry the fresh water to your taps during the season. I guess I would rather ensure no freeze damage (and associated repair costs) and then do a good job flushing and sanitizing the system in Spring. There is always bottled water for drinking, if non toxic pink is really a major concern. Of course then you have to store the bottled water you need somewhere too.
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