Product review (1 stars): Bad design
The periscope vent idea is a great idea overall, however, whoever designed this particular vent didn't know what he/she was doing. First of all, it doesn't even come with the needed clamps. Thankfully, I already had some. Second, the collars are only about .5" long and barely cover the dryer vents on my dryer and the wall vent. Third, one of the collars was too small to go over the dryer vent on the backside of the dryer, yet it was too big to slide inside the dryer vent. I had to match the ends together and use metal tape to tape them together and create a seal, which I'm sure I'll be replacing in a few months. Lastly, the metal was bent in several places and I spent a good hour straightening it out so that the two ends would slide properly without catching. Also, I ended up sealing the two pieces together where they overlapped one another with more of the metal tape to create an airtight seal due to the fact that, once I started my dryer up, I could feel a small amount of air leaking out.

The only reason I'm not sending it back is because it's such a pain in the rear end to do so. And I have laundry piling up and can't wait another week.