Product review (5 stars): PERFECT PARTS FOR THE BEST DRYER VENT EVER!
These are replacement parts for my 17-year-old Heartland 21000 dryer vent.  I have one in Canada, where it gets full sun for 2/3 of the day, very cold in the winter, and very hot in the summer.  It is in an EXTREMELY windy location, and a regular dryer vent didn't prevent the wind from entering the dryer and then the house.  This one is used with a gas dryer, and I painted it with Tremclad metal primer so it would match the brick.  Despite hitting the cover with a window-cleaning pole, it is still functioning perfectly with only a small crack, so the replacement is in case the crack gets worse when I remove the cover to clean out the vent.  I also dropped the inside cup and cracked it, so I am replacing it due to my carelessness.
I also installed this dryer vent in Florida 7 years ago, where it gets a 1/2 day of sun and still looks like new.  It is used with an electric dryer, and was painted with the same paint as the house.
These parts fit perfectly, of course!