plumbing help

[74tradewindd]

I'm trying to figure out what each pipe is, and the red cut off handles.
Also the small black tube looks like they are connected to the tanks and going outside. any help would be appreciated..

[57Vintage]

More reference, with photos, would be helpful. Where is this in the trailer? Larger pipe that goes up to 11 o'clock looks like drain line. Where does it come from? I assume that is a tank underneath the drain line. Hard to tell.