Product review (5 stars): Fairly easy 1 hr fix
I think this fits in a lot of Whirlpool-made dishwashers, like my 4-year-old  KitchenAid KUDS30IXWH9  (WH for white in color, 9 for version 9).
Symptom was loud buzzing noise while in operation in a normally near-silent dishwasher. As time when by, the wash quality dropped.until dishes came out speckled with food debris.

The fix was fairly easy, YouTube videos showed how, including the fiddling and wiggling needed to seat the part onto the drive shaft and into the holding slot at the same time.

When I got to it, the propeller retainer had come off and was rattling around, making the buzzing noise. Since the propeller was not snug, the screen had clogged up with eggshells and even soft food, which cut the flow of water. The dishwasher works great again.