Product review (5 stars): Worked as designed!
We purchased this to enable us to push the dryer further back against the wall without having to redirect our venting from the dryer to outside.  It was a little fiddly due to the confined space, however, it worked perfectly.  Recommend getting some Scotch Aluminum tape to seal off gaps:  Scotch Aluminum Foil Tape 3311 Silver, 2 in x 10 yd 3.6 mil (Pack of 1)