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DuraVent 6 in. x 14.25 in. Single-Wall Black Stove Pipe Universal Up or Out Install Kit for Chimney Pipe 6DBK-KDBU - The Home Depot
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IMPERIAL 6-in x 8-in Black Steel Stove Pipe Increaser in the Stove Pipe Fittings department at Lowes.com
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Amazon.com: DuraVent DVL 6DVL-X8 Double Wall Interior Stove Pipe Increaser to Vent Smoke & Exhaust, 6 Inch Diameter to 8 Inch Diameter Connection, Black : Home & Kitchen
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6" - 8" Ventis Double-Wall Black Stove Pipe 430 Inner/Satin Coat Steel Outer Increaser - VDB68 - The Fireplace & Chimney Store
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