[rohrmann]

We had a problem with our black tank valve, early on, and it turned out that we failed to educate a relative that stayed with us a couple of days, and she tossed one of those wipes down the toilet, and the weave of the wipe hung up on the fitting at the valve, which required a total disassembly of the valve. When they made repairs, they had cut the 3" line away from the elbow, and put a rubber repair coupling get the cut, which adds a little flexibility to the lines. Have not had any trouble since.