Product review (5 stars): THIS SAVED MY FRIDGE!
I had terrible ice buildup on the bottom of my Whirlpool refrigerator/freezer combo, and we were defrosting it 1-2x per week, pulling the inch-thick ice sheet out of the bottom and chipping away at the ice that had built up on the food. It turns out that there is a known issue with the rubber drains that these units were originally manufactured with and there was a recall during which time owners were provided with free replacement parts, but the fridge came with our house and we were well past that period. I purchased this part, installed it myself, and no more ice! It works like a dream.

One thing to note is that the video I watched and written instructions I read to figure out what to do (the paper the part comes with is less than helpful) said that you had to take the freezer door off, and do all these steps to get at the back of it - none of that was actually necessary. Unless you have ice buildup in the drain itself, you can skip all of those steps (and save yourself a lot of time) and just take off the panel in the back of the unit. You never even have to open the freezer.