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Re: hex bolt size
It's easiest to remove the whole housing (3 pieces) from the head together. I believe there are only three bolts holding it on. It has an o-ring that seals it to the plastic pipe piece, be caeful as it's easy to break the pipe. Each of the other two sub-flanges have two bolts holding them on. My advice is to get all three pieces & all new o-rings, VW is fairly reasonable price-wise.
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