Hello. I am a new owner of a 2020 Delano TT and love it. There is a T handle that is in the open position on the opposite side of the camper from the 2 T handles used to dump the grey and black tanks. It is located behind the engine exhaust pipe and appears to be on the black tank drain pipe. What is it for?
Keep all tank valves closed until ready to dump. Our dealer explained it this way: the valve on the opposite side holds the solids up in the black tank. The valve below the black tank should be kept closed to keep solids out of the cross over pipe (warning pun approaching) if left open a log jam is created.
Make connections to dump and open both to dump black tank.