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Lanny · 05-01-2021, 11:19 AM

That is the engine Ventilation Down Draft Tube.

It's been replaced by the PCV valve, on most newer engines.

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05-01-2021, 11:19 AM	#3
Lanny Senior Member Join Date: May 2010 Location: Mn Posts: 2,411	Re: Merc flathead That is the engine Ventilation Down Draft Tube. It's been replaced by the PCV valve, on most newer engines. . __________________ If mama ain't happy, ain't nobody happy. But if daddy ain't happy...RUN