Product review (4 stars): it was fine. I only used the front side
As just for a dryer vent cap on my outside wall, it was fine. I only used the front side, (exterior) to complete the installation. The rear part I didn't need. In order to get the flap assembly completed flush with my exterior wall, I had to file off the small plastic tabs on the side of the cap facing the wall. Calked it and it looks and works fine. I only gave it 4 stars because I really didn't need the rear portion of the assembly that the vent pipe runs through.