Product review (5 stars): was relatively easy to install and permanently solved the freezer icing problem
This is the part Whirlpool omitted from its refrigerators in lieu of using the notorious clogging rubber duckbill drain fitting.  Interestingly, the part snaps into the drain pan as it already has the required mounting.  Why Whirlpool did not use this part in all their refrigerators is a testament to corporate greed and to manufacturing a product with a known drainage defect.  The part works as intended, was relatively easy to install and permanently solved the freezer icing problem.