Amazon.com: Dryer Vent Wall Plate (4 Inch, Black) Plastic Duct Connector Flange for Ventilation Straight Pipe, Cooling and Heating. Small Through The Wall Trim Collar Ducting with Mounting Plate Quick Connect :
Vent Systems 4" inch Air Vent Duct Connector Flange Straight Ventilation Pipe Plastic Ducting Connector Plate For Cooling Heating Ventilation System HVAC 4" inch - Pack of (1) - - Amazon.com
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