Product review (4 stars): stops all leaks
This thing is great.  it is -10 outside and you could feel it in my dryer with my standard flapper.  I put this on and started the dryer. It blew the top off the first time (user error).  It stopper the cold like it is designed to.  It is easy to clean if needed.  I have done about 30 loads so far no problems.  the plastic does look brittle, and it does need painted to prevent breakdown from UV light.