Originally Posted by ReikiRocket
I can’t figure out what they’re for or why they go up to the ceiling.
What are they and do I need to keep them? In other words, do they have to stay in place and be in the way? Or no?
They are the vent pipes for your plumbing, black & grey tanks. Without them, your sinks will not drain and your tanks will not fill properly as air cannot escape for the water to displace it.
The pipes can either "remain as-is" if you don't want to mess with your tanks or they can be "moved" or "modified" if you want to move/modify your tanks & plumbing. Regardless, if you have tanks, you need to vent them somehow.