Hi All, 2005 audi a6 2.0 tdi.. Is there a black rubber seal on the anti- shudder valve..?? was it meant to be there..?? mine seems to be bulging out and by the looks of it it's been seeping for a while. Is this replaceable..?? Did anyone have a part number..?? I cleaned my egr valve yesterday and spot this rubber seal hanging off the underside of the anti- shudder valve... thanks in advance.