RAEFLOW Dryer Vent Cover 4 inch with UV RESISTANT Outdoor Dryer Vent Cover Natural Energy Saving

Raeflow Dryer Vent Seal replaces standard 4 in (10.2cm) dryer vent hoods and louver vents. The hot air pushes an inner plastic cap up, the air and lint blow out and when the air stops blowing, the piece returns to it’s resting position to block out unwanted guests and cold or hot air from the outside.