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I have gotten a new 1-way check valve for my 1.8T engine which has had vacuum leaks and bad check valves.

Long story short, I don't know the original orientation of this check valve in the small vacuum line in the evap emission system that connects to the large turbo inlet pipe next to the MAF and the airbox.

Does this check valve flow towards the large turbo inlet pipe or away from it?

I have made my own guess, but now I'd rather hear the correct answer. Thanks.

By the way, the check valve removed from this spot was an odd right-angle valve which I have found nowhere online. Moreover, a local VW shop swore they had never seen such a thing for this engine as a right-angle check valve. One parts site lists the ordinary straight version as part number 058905291K.
 
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