Product review (5 stars): Took minutes to install and seals great. It allows you to reduce the amount of ...
I Have a stack washer dryer slid into a small closet, I have no idea why I didn't think to get one of these years ago.  it allows you to slide the unit almost all way back and then hook up over top.  I put this in the ceiling.  Took minutes to install and seals great.  It allows you to reduce the amount of slack pipe you have which just gets crimped and develops lint.  Awesome product