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Hi my name is Robert...
Shine a flashlight down the pipe leading to the black water tank to see how the flange is attached. The flange attaches approximately 1 to 3 inches down the tube. Normally you can see the glue at that point. IF you do not see any glue then twist the flange counter-clockwise to detach it from the tank, it takes some force to get it to move, some flanges also slip in and you can pry them out with a block of wood and pry bar. If you see glue on the piping the only way to change that out is to try and get a chisel and try and knock the glue off and then twist and pull on the flange, the other option is to cut the piping out and glue in another piece.,.... Hope this helps some, IF you have more questions or concerns please feel free to contact me... Robert
Hi... Was just checking in to see if my answer helped???? IF you have more questions or concerns please feel free to contact me.... Robert