Placement low point drains on 2005 Mtn Aire gas

I believe this post covers it. Did you see this in your research?

“Look at the water bay. Note the two knobs labeled as "Low point drains". Now note below them, as far back as you can reach, a hole in the back wall also labeled as "Low point drain". Stick your hand in that hole and feel around and you'll find a valve you can't see. This is the fresh tank drain.”