Had that dilemma (I think) years ago. I think you can take like a Dremel or similar tool with a round cutoff blade, cut around the inside of the sewer drain, remove it and replace with a new section that you can put the flange on...if that makes sense. You will need to reseal/glue the new section.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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