HY-C Aluminum Band-Around Single-Flue Chimney Cap. This should be a 17" x 17" model as it measures 16 5/8" from corner to corner. Used for less than three years. Decided to run a double walled pipe up through the chimney and had to cap it differently so I could not use this anymore. Feel free to ask questions. This sells for $125 new at Menard's so I am just asking for less than half.
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