Help Identifying Vacuum Pod/line. 1971 250C

What am I looking at hear and what should be connected to the pod and what should be connected where the bolt is plugging the vacuum line? Vehicle is my 1971 W114 250C with a M130.

What am I looking at hear and what should be connected to the pod and what should be connected where the bolt is plugging the vacuum line?

Vehicle is my 1971 W114 250C with a M130.

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