I have had to search and search on occasion to find the drain and frankly never did till I removed the tank.
On my current coach there are two quarter turn valves just off the tank outlet, one is the main tank valve and cuts off water to the pump, no water comes out of the tank if it's closed, the other is (Depending on iof you hook anything to it) either the winterization intake or the tank drain (As configured from factory tank drain, they could not even gut a dual purpose valve right).
Of course the other thing they screwed up, the outlet is 1" above the tank floor.
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