I will try to post pic, but won’t be going out to RV for a few days. If your unit is like mine, there are three vertical pipes on the back wall of the “water” compartment where the Nautilus UniCentre is located. The most forward or left hand one is blue with a chrome handle on it. That is the one I turn to empty my fresh water tank. It takes forever but will drain out the fresh water. As I said before, the middle one is red with a chrome handle, and the third is another blue with same chrome valve. I keep them all turned to closed position unless draining. If your unit is different, then I’m of no help. There were no valves inside of my RV to turn, as the manual apparently states.
The hot water tank low point drain is on the other side of the rig, in the compartment next to the hot water tank. Also a chrome handled valve which when turned, allows the 7 gal hot water tank to drain.
Hope this helps you as I also was confused and trial and error seemed the only way I found put how these operate.
Bob
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