Product review (5 stars): Fixed my 2008 KitchenAid KUDK03
This matched the original failed part in my KitchenAid KUDK03 (which I've had since 2008) and fixed the problem I had with the dishwasher not filling again after the initial rinse.  It seems after the old valve heated up from the initial fill, it wasn't able to re-open until it cooled off, which made the dishwasher sit there doing a lot of buzzing, but never really getting things clean. I tried a diagnostic cycle and got the same behavior so I took a chance that it was the valve itself (since that seemed most likely) and ordered a new one here.

The installation was fairly straightforward, although the old part was screwed on ridiculously tight, nearly requiring a vice to take the hose connector off.  It was also a bit tricky to ensure the elbow ended up in the correct orientation.
Now my dishwasher is back to normal and getting the dishes as clean as ever.

On a side note, the one other problem I've had with this dishwasher in the past was when the food grinder blade apparently fell off due to ingesting part of a plastic bag.  After that happened, the dishes didn't get very clean in the bottom rack and barely even got rinsed in the top rack.  I guess without the grinder, the disc eventually got plugged up with food particles until the pump couldn't generate sufficient pressure to get much water at all to the top rack.  Anyway, a replacement grinder wheel/blade (also from Amazon) fixed that right up too.