Product review (5 stars): Just what I needed
I looked behind the dryer in our new house and found the 4" dryer hose smashed and detached from the outlet pipe. Reason? There never really was room for a 4" dryer hose to make the bends it needed to make in this very tight space. I'll bet a lot of people have similar issues; many homes today have "washer dryer closet" rather than laundry rooms, and these closets are often a few inches shy of the space actually needed for a dryer vent hose. So the hose gets squished and stressed into shapes it was never really meant to take.

Wife wanted me to raise the dryer up (that's why I was behind there in the first place!), and I built a platform for it, but I needed a clean and simple way to handle this venting problem. This thing was perfect for the job, and is not stocked at the big box or smaller shops near me.

Installing it was fairly easy for me. I slid it to an approximate fit (a little long, on purpose), cut with tin snips, tried it again, adjusted by about an inch, and made my final cuts. Then I taped all seams with duct tape. I was able to get the dryer in place and everything lined up by myself, while my wife was out shopping. I did use large hose clamps (the worm-drive kind) rather than the included clamps. A nut-driver is very welcome here. Once done, I ran the dryer to test. Airflow from the vent outside seems a lot stronger than before. That's good, clothes should dry faster now! The whole project took about an hour.

Shipping was great, too. I ordered on a Thursday evening and though Amazon predicted delivery the following Tuesday, got it Saturday afternoon - FedEx delivered it even though I had chosen standard shipping. Glad it showed up so quick - saved us a trip to the laundromat!