Yeah, that's the EGR VSV valve... & yeah it's broken. It should have an oval cylinder on top like this:

Iirc in reading, the cylinder is meant to smooth the pulses from the intake air. I've also read of ppl running them like that & having no problems... but that seems like it would create a vacuum leak to me...? You could prolly get a used one at a junkyard or Trail Tough.
Hth,
Fuzz