Yes, it passes through the fire wall/bulkhead and what you should be able to find under the soundproofing will be the rubber part that valve fits into. Someone with a newer version of
Ibiza/Polo/Fabia discovered that the rubber part was incorrectly fitted and was blocking the flow of condensate out of the air box, so water was escaping into the cabin instead of being allowed to escape outside of the cabin.
Edit:- item 13 fits into items 4 and then item 10.