Product review (5 stars): Have looked for a replacement of a unit I bought so long ago I don't know when.
This is the best energy saving dryer vent I have ever found. It is easy to install and is always closed when not in use. I needed to replace the first one because it is on the south side of my home and the sun dried out the material it is made from. In looked everywhere I could think of locally and the did a gooogle search  for dryer vents and found it could be bought from Amazon. I could not be happier. Thank you google and Amazon.