If you want to make one yourself, search the mb list mindspring.com something or search the original author under garageboy ,bmw.I made one myself using a bicycle pump,Rubbermaid bottle,junkyard cap(good for both Volvo and MB :ATE reservoir),tubings,rubber stoppers of venepucture tubes,tire valve scavenged outside tire shop(Canadian Tire stores change valves with every tire purchase,therefore plenty of good valves being thrown away daily).

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Tom 1992 300E 2.6