Product review (5 stars): The Perfect Fix
Worked perfectly on my Kirkland Signature (by Whirlpool) washer. The agitator is actually something that you wouldn't notice could be worn out unless you have the lid open and are watching the washing process... which happens to be exactly what I was doing... not sure exactly why... but I digress. Anyways, I noticed that the upper agitator wasn't moving so I looked it up online and BAM... a YouTube video showing how to fix it along with the part!

As the video showed, it was incredibly easy to install and took less than 10-minutes. You will need a ratchet extension to untighten the agitator nut.

I also loved that it is part of the add-on program because if I had bought this is a hardware store it would have cost me around $20. It's a steal of a deal!