I have a Tiffin 2018 Allegro Bus 40 AP with a Dometic Concerta 4100 series toilet. The bowl no longer holds water; was in Red Bay, AL and had the seal replaced, then re-adjusted number of times. Sti...
LOL! I just applied some plumber's grease to mine (Thetford) for the same reason, and sat down to look at the forum and here's a thread about the same thing. Yes, it works for me for a good month. But it only takes 30 seconds. Good luck! JK