Don't recognize it. Can't quite make out the color - is it Metallic Silver or Medium Stone Gray? Possibly not LEGO as the internal ribs look unusual, but I'm not overly familiar with some of the less common Technic parts. If it's genuine LEGO I would have thought a part that size would have a design ID somewhere.
Looks like 60930. I use this part to help differentiate between pearl light gray and flat silver, as it comes in both colours and has a nice large surface area.
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