Product review (5 stars): It does the job and addresses the manufacturer's initial poor design.
Very easy to install. An essential part of that is making sure you defrost. If ice continues to cover the little hole the water goes through before it runs through this anti-siphon like piece, you have not addressed the problem even if you have installed the part properly. I recommend using a baster to put hot water where the ice forms in the back of the inside of the refrigerator. (Somewhere in the middle you will see the little notch there). Once the area is free of ice and the hole is clear, water will drain in the catch tray in the back of the refrigerator where the tube drain ends, and this way you know you are now in business. You should use a blow drier before you restart the refrigerator to make sure the area around the notch is as dry as possible. Once you've done all that, there is an excellent chance you will never have this problem again.