Product review (1 stars): didn't check it out well enough before buying
This item did save space and connect my dryer to the wall vent.  The picture shows round corners but the one I rec'd has square corners.  When the duct is collapsed down to smaller size , the ends extend causing wasted space. The air flow is impeded due to square form with no curve diverter to make a smooth path for exhaust and make the dryer more efficient.  Since this unit is not constructed tightly there is hot air and dust blowing around behind the dryer.