I pulled out our toilet last fall and replaced both valves, as one started leaking. I used the foam ring when replacing the toilet in the RV. I did not notice any problems with the original foam ring, so I used the supplied ring. I completely cleaned the toilet on the driveway and let it drip dry. Total time including drying was about 1.5 hours. No problems so far.
May your smiles be many and the miles be plenty.
Karen & Allen Van Zandt