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4-Inch Diameter Galvanized Transition, 3 1/4-Inch x 10-Inch to 4-Inch Rectangular to Round Duct Galvanized Round Transition for Connecting HVAC Duct Pipe Fittings
4-Inch Diameter Galvanized Transition, 3 1/4-Inch x 10-Inch to 4-Inch Rectangular to Round Duct Galvanized Round Transition for Connecting HVAC Duct Pipe Fittings

4 inch