Product review (5 stars): Easy install using foil tape...
Great space saver vent pipe for a stacked dryer.  My dryer is full size and heavy duty on top of similar washer.  This vend pipe extended to reach with an offset of over a foot to the side where the round pipe goes outside.  I sealed all the seams with aluminum foil tape, supplied for HVAC and other uses.  I added a short 4-inch pipe to the top port - a piece cut from the overly long pipe coming thru the wall.  I sealed the pipes to this telescoping pipe using foil tape also.  Very neat install and easy to do.