When storing my RV for awhile, I drain the water from my toilet pour in a little cooking oil, usually canola, on top of the valve gate, work it a few times then put some water back in it. Has worked for quite few years on various campers.
I have had to change a toilet out once, but that was due to a mech. breakage, Knocking on wooden head, never had a seal problem so far.
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Former owner of 2015 Thor Vegas 24.1 in Ocala
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