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Some ideas: Use a Fernco rubber bushing (donut) and a 4" PVC stub to standardize the diameter a bit. Here are some photos in a discussion thread. That person used polyurethane caulk, but I'd look for a rubber bushing for more stability and a more reliable seal. Fernco also has their own wax-free toilet seal that may work, but I don't see one for a 5&...

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