Product review (5 stars): Dishwasher Elbow
I had to get an adapter from a local hardware store to fit my new dishwasher. The threads on this elbow didn't work well with the adapter and I kept getting drips. The plumber at HD put it in a vice and cranked it down with a lot of Teflon tape and it finally worked drip free.

That being said, this elbow is a great way to connect your dishwasher to PEX.