Angled vacuum valve used at the brake booster.
Original Mercedes-Benz part
Part # 0004316407
Part # 0004314307
Part # 1232700079
Part # 0004600284
Part # 0025454814
Part # 0638986001
Part # 7101322591
Diagram # 03-10-21
Part # 4195537840
Part # 0089976082