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The Craftsman Blog - Ever wonder why there is a pie plate on your chimney? There's good reason! That pie plate covers something called a chimney thimble port; a circular hole in
ADJUSTABLE FLUE STOP : Amazon.ca: Tools & Home Improvement
Collectible Flue Covers for sale | eBay
Vintage flue covers
IMPERIAL 6-in x 8-in Off-white Galvanized Steel Stove Pipe Flue Stopper in the Stove Pipe Fittings department at Lowes.com