Product review (5 stars): Easy to install - just unscrew the old one and ...
Appears to be a genuine part as described.  All the marking are the same as the original.  Easy to install - just unscrew the old one and put the new one in.  The center "pop up" on the one I replaced no longer "popped up" so the dishes on the top rack weren't being cleaned.  This new wash arm has corrected that problem, and I hope to get a few additional years out of my dishwasher before I have to replace it entirely.