RV Toilet: Chemical or Marine?

My wife and I enjoyed your sessions at Hershey, PA again this year.  This is the second year that we have attended.  Anyway, to my problem.  Re: Chemical toilet - It has been working just fine then all at once I notice the seal at the knife shut off is off-center by about 1/4 inch. It still seals and holds water fine but I think it should be corrected. Should I mess with it? Gary, (PA) 

Gary, are you sure you have a chemical toilet? Also known as a recirculating toilet? They  do not have a water seal in the bowl. But if you’re talking about a typical RV, marine toilet, they do. It would help if you had the make and model number, but I feel seal replacements are doable by the diligent RV handyperson. It’s a tedious task and not-so-pleasant, but it can indeed extend the life of the toilet and ensure proper maintenance is maintained (pardon the redundancy!). All replacement parts kits from the established toilet manufacturer’s will come with detailed installation instructions which should be all the help you’ll need. If you send me the brand and model number I’ll search through my files for other info that might help.