Product review (5 stars): Exactly what I needed
My Kenmore series 90 washing machine had stopped agitating or spinning, but would still fill and drain water. After searching for answers, the verdict was that the pump drive coupler had broken, which is a pretty common failure in these machines.

I bought two of these (to have a spare) and now my washing machine is churning away downstairs, good as new. For under $6 and some Saturday time (there are how-to videos online) I saved an expensive service visit or an even pricier new machine  :-)