What part is this?
 

I just replaced my lower manifold gasket. She is all put together and runs like a dream! Except for one thing. At some point during the process, I broke a part.

It is the part that connects the EGR to the exhaust manifold at the back of the engine.

Attachment 15402

That is the best picture I have. (Picture is pre break)

It is to the left of the injector, and is silver and somewhat round. The silver round thing broke off of the brass adapter that connects it to the exhaust manifold. What is this part called? Can I even order this thing online?

if it is conected to the air pump , and its at the back of the motor . I think its the check valve . Prevents exhaust from back flowing into the air pump. hope that helps

That is the EGR tube 200 bucks at the dealer or like 30 from summit. Its fairly easy to change I've done one on my truck