for those who have seen it before, here's the modulator for my 82 300DT:

http://catalog.eautopartscatalog.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=1YD0NAI2L1YD0NAOXJ&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1982&product=J5020-102310&application=000010721

for clarification: the rubber cap talked about in this thread goes over the brass tee pictured.

is removal of this item something that is covered in the shop manual? is it particularly difficult?

amazingly my local MB parts counter had both the rubber cap and the o-ring stock. woo-hoo!

thanks again,
dd

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car