Water bay reworking

I understand the basics of my water bay and its limited valves. I plan to move the pump to the water bay and remove the hose real and try to condense and better organize some items. First what are the 3 water valves for 2 blue and 1 red. Besides plugging in a hose what was the point? I could guess an outside washer, who knows. Also see the water pump currently under the bed. I would like to rework this to design as well. We full-time in the coach and want it to work for us. Practical is more important than looks for us use. Thanks in advance.

2001 h3-45