Photo 1 of PATIKIL 8 Inch Duct Connector Flange, ABS Square Air Ventilation with Duct Backdraft Valve for Heating Cooling Ventilation System, Black

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Photo 1 of PATIKIL 8 Inch Duct Connector Flange, ABS Square Air Ventilation with Duct Backdraft Valve for Heating Cooling Ventilation System, Black