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Originally Posted by dcbenny
I rub some Vaseline on the gasket about every 6 months no issues anymore
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You shouldn't use Vaseline.
From the Thetford page
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Can I use Vaseline (petroleum-based product) to lubricate the seal?
No, it will cause the seal to further deteriorate. We suggest use of a toilet seal lubricant or drain valve lubricant to lubricate the seal.
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