| Options | Without valve |
|---|---|
| Brand | Unbranded |
Check the listing for details. Ventilation Backflow Preventer for 4 Inch Dryer Vent Adapter Installation. Condition: New. Listed at 20.49 USD. Strong for protection: specially designed for ventilation systems such as bathrooms and kitchens, effectively blocking cold air backflow, noise backflow. Material: Printer waste ink sponge. Specification:With valve, without valve（Optional）.
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