Product review (4 stars): Why your water line freezes in the first place
It works.

Here is why you get the water line freeze: Everytime you decrease the temperature of the freezer, the freezer blows freezing air dirrectly at the back of the water dispenser to try and get the whole freezer to the new right temperature. This freezes the water line.

If you are constantly adjusting your freezer temperature up and down you can either use this kit or you can place insulation between the blast of freezing air and the water line. Perferably insulate just behid the water line.

Or you can do what I did and leave the freezer at a set freezing temperature and have no problems. Hint if your freezer ice is clumping together your freezer is to warm. Decrease the temperature until your ice does not clump. This also makes maintance a lot easier. Of course your water line may freeze so you at least want to temporarily

You can unfreeze a water line with a hair dryer. It takes a little longer than you may expect.