What does this part do? Is it a check valve?
I have had 2 vac booster failures since my conversion which I attributed to cheap booster (Advance auto parts), but at least it's a lifetime warranty. Maybe I need this part. 
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86T 009s/TT93, Cold K&N, 160, test pipe, Hybrid alky, BSTC, misc other basic crap. Loose nut behind wheel.
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