1995 E320 Wagon Hoses/ Vacuum Line Idenfication Help

[Bfox]

Hey all,
I am new to the forum and Mercedes. I recently picked up a 95 E320 Wagon. Previous owner said it stopped running recently and didn't want to mess with it. Ive gotten it to crank over after replacing some fuses (thanks to previous posts on the forum), new battery, and new neutral safety switch. Im going through the engine bay replacing hoses/ lines that are bad or not connected and cannot figure out where this line goes. Im sure it's something simple but learning as I go here. I added some pictures showing the line im needing help with. Any help would be appreciated. Thanks