Product review (5 stars): Dryer vent cap
The only thing I don't like is that the outlet will allow insects inside. This would be a really great place for a hornet or wasp nest, so if you do buy one of these, you will have to put a mesh screen around the bottom that can be removed to clean any lint buildup.

Other than that, this was very very easy to install. I bought concrete anchor screws (with a drill bit) and sealant in a tube as my siding is brick and it was smooth sailing, and this is coming from someone who invariably has problems anytime using tools. I would recommend to anyone. It works as promised.