FYI, yesterday I removed the second section under my trailer so I could get to the valve for my black tank. This isn't fun because my gas line was on top of some of the screws holding the cover on. A chisel took care of them. You do have to cut the insulation behind the cover because it appears to be one piece and the valve is right behind that. My problem was toilet paper, I must have closed the valve while there was some in the way. This did not allow my drain valve to close all the way. I also cut the 3.5 drain pipe and put in a rubber boot to help with the reassembly. There are two rubber gaskets on each side of the valve you have to get back in and they can be a bugger. Make sure you have no leaks before you close everything back up. I had to do this a couple of times to get it right, in fact I haven't put any covers back on. Foil tape will close up the insulation and you will need new screws for the cover.
If the handle on your black tank doesn't go in as far as it once did you may have the same problem.
2008 Designer 35 RLSA
