Monk,
You do have to take off several feet of the protective layers of stuff. Just start unscrewing. Then you may have to cut the protective layers to actually get to the plumbing. When you put it back together some folks have been using duct tape of some kind of super strong tape. We also used fender washers when we reinstalled the screws. They just give a lot more support around the screw area.
Many of us have installed an additional"gate" valve at the very end of the plumbing run. This keeps you nice and dry when you open the valve to attach the sewer hose to the trailer plumbing. We also have installed a clear see through section of plumbing. This lets you see when the black tank is completely cleared out.
Good luck and let us know how it turns out for you. By the way there are tons of discussions on this issue here on the Forum.
HamRad
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