Product review (5 stars): Solved an ongoing problem with freezer leakage.
This part replaces the drain tube's duckbill gasket design flaw for the Whirlpool bottom freezer refrigerators.  The repair part's instruction sheet is minimal, but there is a You Tube video online from 2013 that gives good step-by-step instructions. The merchant speedily supplied the part the same week I ordered it at standard shipping price.