Product review (5 stars): This did the trick on KitchenAid Superba
Not sure how many people who live in a frozen tundra have had their floors flooded by a valve that apparently malfunctions when the water is too cold - that's at least what I have read and heard.  Anyway, I'm quite handy and decided to tackle this myself instead of spending hundreds and this absolutely did the trick on my KitechenAid Superba dishwasher.

I would also expect to buy: small/tiny crescent wrench, sealant tape, quite possibly the copper adapter that attaches to the valve (I was unable to remove mine from the old valve even under considerable force) - all of which you can find at any hardware store.