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Thetford Cassette Lip Seal Replacement Question

Mobean
Mobean Member Posts: 72
in Heating/Plumbing & Winterizing
2021 TAB BD.  Thetford C402C cassette toilet.  Estimated 20 - 25 days of use since TAB purchased new in 2021.  Thetford Toilet Seal treatment used according to directions when stored.  Cassette was stored inside during winter. Last trip after the first night we noticed water under the TAB by the toilet (the cassette area storage compartment was full, Bleah). Cassette was sitting properly in the compartment.  Pulled out cassette and noticed cassette Lip Seal was peeling on outer surface(?).  Once peeled off this top layer, seal looked in good shape and seemed to work fine next night.  Not sure what the peeling was all about but wondering if the material is breaking down.  How often are people finding this Lip Seal needs replacement?  
2021 320S BD
2020 V6 Chevy Colorado
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