Yup, I know that part....

As illustrated previously, It Appears to be a vent to atmosphere

The device its attached to is the VCV which controlls the vac supply to the Trans. Modulator...

I'm not sure if this rubber part is available as a separate item....

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http://i190.photobucket.com/albums/z...0TDnoplate.jpg

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....