Draft Blocker 4 Inch - Backdraft Damper - Draft Stopper - Backflow Preventer - Vent Deflector (4'' Inch)

Draft Blocker 4'' Inch - Backdraft Damper - Draft Stopper - Backflow Preventer - Inline Fan Vent Deflector - One-Way Airflow Ducting - Dryer Duct Connector with Backdraught Flap

EesTeck 4" (Diameter) Adjustable 304 Stainless Steel Duct Clamps Hose Clamp Pipe Clamp Air Ducting Clamp worm drive hose clamps (4Pcs, 91mm-114mm)

4'' Inch Duct Splitter for Exhaust Fan Dryer Vent Hose 3 Way Duct Hose Connector, Y Shape, Y Joint Metal (4'' Inch, Y Shape)