So a few years back I replaced with Porsche cap 04. With last year condensation issue, I tried OEM non-Porsche. It seems to hold pressure, it was 'O' rings in purge. The non Porsche will not have the part number on it so no one will be able to tell if it's a 04 version. I taped the part number from the bag onto my expansion tank.
Spend the whopping extra $26 on the real thing
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2002 S - old school third pedal
Seal Grey
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