The best solution is to remove the Thetford & use a sledge hammer to stop the leaking & replace it with the Dometic 310 or 320, but if you don't want to do that use some plumbers grease or the silicone lubricant mentioned above on the seal occasionally (without removing the toilet).
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Fulltimed 10+ years
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Replacement undetermined
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