Flue size issue

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The flue on the stove is 6 5/8 inch OD looks like sch 40 steel pipe, any suggestions on how to hook to 6 inch single wall black stove pipe??
What is the id? That's what matters
 
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if you do that any condensate would leak all over the top of your stove. Double wall would go inside as well but the second wall on some stoves fits over the outside.
 
Inside is 6” I thought the first piece of stove pipe is supposed to fit over the flue collar of the stove ??
That's only for double-walled stove pipe. The inner layer of the double-wall is still inserted inside the flue collar.