Product review (5 stars): exactly what I needed
After stupidly neglecting dryer vent cleaning for years I finally bought a snake brush and pain painstakingly cleaned the vent shaft.  The vent cleaner is already paying for itself in increased dryer efficiency.  The old dryer vent cover was in poor condition and didn't match the house.  I bought this as a replacement and couldn't be happier.  It has options to physically mount it but I just squeezed in the tube a little, slide it into my dryer vent, and it fit very snug and secure.  Looks 100 times better than what I had and matches my siding.