Product review (4 stars): Why can't builders use common sense with vent pipes?
This solved a 20 year problem in my house in the laundry room where there is little space, and the outside vent pipe lays up against drywall and is either too high or low, depending on your viewpoint.

Anyway, to the point, the magic of this is the rotating coupler to the dryer.  What I means is, you fasten it to the dryer and it allows the dryer hose to pivot.  It works reasonably well although disappointingly, it does not really save any space compared to just making a bend with pipe.  The other part that works well is the corrugated metal pipe which allows you to stretch it a bit, but minimizes the length, which avoids the metal foil pipe which snakes for about 10 feet behind your dryer giving you the dreaded "AF" error and not allowing proper airflow.

The coupler to the wall pipe did not work well for me and I had to do some metal work, but that's my home builder's fault.

This this is a bargain and after years of struggle, the dryer works as intended