Features Backdraft Damper: A duct connector which is equipped with backflow damper device to ensure stable airflow without leakage. Perfect Matching: The air flow stopper suits perfectly for 6in flexible or plastic pipe on dryer, exhaust fan, and so on, useful and reliable. Single Way Flows: Allows for automatically switching, this return blocker only allows for 1 way flow as well as damping. Premium ABS Material: The application of premium ABS material and sturdy structure bring excellent durability for long use. Easy to Install: The ABS duct connector accessory has light weight and compact size, the installation can be quickly completed in minutes. Specification: Item Type: Backdraft Damper Product Size: 6 in Material: ABS Drive Mode: Automatic Switching Flows Direction: One Way Package List: 1 x Backdraft Damper Package List 1 x Small Stereo Audio Preamplifier 2 x Audio Cable