Thread: Mann Hummel advice sought
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Old 01-12-2020, 11:46 PM
CarlC CarlC is offline
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The MH part, like the Provent 200, is meant to be used in-line with a PCV valve. Basically...

Drivers valve cover -- PCV--MH-- throttle body vacuum source.

Vacuum is needed for the drainback valve to actuate.
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