Hmmm.....The oring at the top of the chimney everyone said appears smaller than the extra.....is it the small black one you see when you take the top cap off? If so, mine was bigger. The extra was skinnier and larger. Didn't even snug up to the chimney. The stock was a little wonkey looking when I took the cap off. Like it wasn't on right, or like you'd expect the larger extra that doesn't snug up to the chimney would be. Put on the extra anyway and have not had any leaks. No confidence here though.
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