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It is not how long a Thetford will last, it is how many cycles it will survive. There are many RV's that are only used several weeks per year and a number of them used much more frequently. For the RV's that are seldom used, the original will last them a lifetime but from the information I have gathered from this forum and my own personal experience, I would estimate that about 2 years of use is an average for the original commode.
This forum is a great source of information, much of it is even useful so keep the useful information coming.
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