Alfa Sei DeDion curiosity

[Joe Elliott <jee@domain.elided>]

http://www.andrew.cmu.edu/~jee/junk/cutaways/alfa6(car)rear_end.jpg

I don't know where I found this picture originally, but I was just 
looking at it, and now I'm wondering what the heck that cylindrical 
thing on the DeDion tube is.  Anybody know the answer?

Joe Elliott
'82 GTV-6
'73 Opel GT

PS> Anybody want to sell me some used pressure switches for the GTV-6 aircon?
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