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I just replaced the seal in my dometic 300 (plastic) toilet. I followed the instructions from several Youtube videos and it was really easy EXCEPT…. the seal would not sit flush in the grove at the front of the toilet. Upon closer inspection, I found what appears to be part of another seal stuck in there. The original seal was not torn, so there must be a 2nd seal between the bowl and the base, but I’ve found no mention of that in the manual or parts lists. If this is a 2nd seal, I’m pretty sure I will have to remove the toilet to replace it. Have any of you had a similar experience? I think if I have to remove the toilet, I’ll probably just replace it with a better model. The added weight isn’t an issue for me. Thoughts? Suggestions?