Product review (4 stars): Works, but a little flimsy.
The box I got is marked Maytag, but this is universal.  This installed on a Samsung.  Works fine, but ...
It is NOT 8 feet.  Stretches to 7'4" tops. (and to the couple reviewers that say each piece is only 2 feet, try stretching them, like an accordion, as the instructions show)  Warning - the connections are flimsy and will not take much stress without popping.  If your installation does not require much bending or coercing, it's fine.  It only comes with two clamps.  The center section pops together.
I included a copy of the instructions.
AND MOST IMPORTANTLY - I took a picture of what was inside the old vent.  This is why it needs to be periodically replaced.