That's a vacuum restrictor and/or a check valve. The EGR should look like this
http://img.eautopartscatalog.com/live/B701055377DEL.JPG
Michael
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Usta haves '69 250/8, '76 280C, 1971 250C 114.023, 1976 450SEL 116.033
Current have, 1983 300SD 126.120
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