If you have Ecoboost you need these check valves! I've included the factory in my photos for reference which are just through. The new check valve connects in the same place as the factory one, but provides a non-return system to avoid 'pushing/vacuuming' your crankcase. It's of course amazing why Ford didn't fit them from the factory, but when combined with a catch tank your Eco will run as cleanly as possible without creating sludge! 15/10 recommend
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