That’s a clean side separator, kind of like a catch can but for the “clean side “ or intake side of the PCV system. You can read more about here in my build thread if you like. Here’s a link. Don’t blame me if you get lost in the thread and don’t come out for hours.Does ur oil filler cap have a tube to the intake?
What set up is that?
https://www.tahoeyukonforum.com/thr...ali-build-thread-aka-the-beast.83457/page-249