Product review (5 stars): Easy fix
Works perfectly in my 12 year old Kenmore model 80 washer.

Our washer was slowly draining tub contents onto the floor.  After googling the problem it appears that the pump is often the problem.  After following YouTube instructions on exposing the innards of the washing machine, the pump was indeed the problem.  Drip, drip, drip even when the tub was nearly empty.

I ordered the 8559331 as a replacement.  The different serial numbers were a bit confusing.  The pump I took out didn't have exactly the same serial number, but it looked like the picture on Amazon.  Apparently the same direct drive pump is used by many manufacturers in many models.

The whole replacement process went quickly and smoothly.  Be sure to watch the YouTube tutorial.  Accessing the pump is only easy if you know the right sequence of screws and connections to undo.