After further examination, the flange seal on the floor looks like it has seen better days. Will be running over to the rv shop tomorrow to get a new one. Would like to get a whole new biffy but it is not in the cards this year. Glad to see that the plumbing through the floor was the same dimensions as a home setup. I was able to use the same compression plug to seal the opening while the stool was off. Thank you all for the input. Conway, disassembly was a breeze and if you had the new seal in hand, smell shouldn't be an issue. I will probably smear some plumbers silicone on the new seal to guarantee a better fit. Probably will hit it with the pressure washer to get any skid marks/klingons out of the inside of the stool. Might even hang one of those little automotive Christmas trees in there too ;).