Product review (3 stars): Good
The picture you see is definitely not what will get.  It's actually the plastic tubing.  I tested out on my dryer.
I had to make modifications.  I cut the tube to be a little shorter and started vacuuming.  The suction from the vacuum did tighten up the top tube, just how the others have reviewed.  I just had to use the other hand to keep the tube open while it was cleaning.  It did do the job, with modifications.