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The Crown Products Co Inc 667PCH8 Square to Round Adaptors, Duct Adapter. This product is designed to provide a secure connection between square and round ducts. It features a 13 7/8" collar and 16 1/8" x 16 1/8" with 13 7/8" collar. It is made of galvanized steel with a 26 gauge thickness. Here are the key features:
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