[CaptainGizmo]

Those lines had me fooled...sure looked like fluid!

Have you, by chance, ever gone into Cummins QuickServe?
https://quickserve.cummins.com/info/index.html

When you set your account up you can enter the ESN for your engine and access all the parts, diagrams, and service manuals.

I'm cruising through mine, now, even though our engines look quite a bit different.

I think I've identified that part, though.  It's the "Aftertreatment purge air actuator"...uh...ok...now for more research.

Yup...I'll be darned...more AIR stuff!  And, yes, the line DOES go over to the Turbo!

https://www.youtube.com/watch?v=9kZljYMRLtQ