It was not PVC that failed on me, but the flex hose from the wall outlet up to the tank. I have replaced them with the metal braided ones. For $5 or $6, I can replace them myself every 4 or 5 years.
I have seen PVC gnawed at by the little varmints we all don't want in our units. This was in a stick house, but they will gnaw trying to get to water if it is scarce. Some may even succeed.
Best to check periodically.
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