Originally Posted by
Jeff Neese
It's very reasonable to assume that even though high-end tube makers like Conti or Schwalbe do produce good tubes and perform a thorough QA on them, they then go ahead and install valves purchased from the lowest bidder.
I recommend shooting Conti and email including a photo of the bad valve or valves. Maybe even a link to this thread as bad publicity is not good for business. It may be something they would be concerned enough about to do something or can tell if it's counterfeit or not.