For starters I have a 1987 Mercedes 300D Turbo

I am trying to find a part ( that I broke) It is in the large vacuum line coming from the vacuum pump to the brake booster. It has one port coming out of it which I believe goes to the vacuum line that that goes to the key switch which then allows vacuum to the fuel shut off valve. It has an arrow on it so I believ it must be some type of check valve also. The one on my vehicle id black and white plastic.

I need to order one.

Thanks.

KDOG88

Those do break alot. You need the whole brake booster line from the pump to the brake booster. It's not very expensive. It's important to replace this and not improvise, as the 2 small nipples the vacuum lines slip on to are specific inside diameters to give the correct amount of vacuum flow to each line.
Gilly

__________________
Click here to see the items I have up for auction at EBay

Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold)

Thank you, found the part and ordered it. Never thought to look under the brake category.