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Check valve brake booster line ???

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Yes, something like that should work fine. I ran one from usplastics.com for a year or so with no issues.
 
Ive used the US plastics valve, and it had a mark on it to indicate flow direction. If yours doesnt have a mark, just blow through it; they only flow one way. You must hook it up so that it wont allow boost from the intake manifold to escape into your brake booster.
 

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