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It's helps ensure there's a proper amount of vacuum pulled on the crank case vent line. I was going to try and run it with and without just to see but that CCV orange fitting is such a pain the butt to pull off (its technically a tamperproof fitting but can be removed with a 5/8" quick disconnect tool if you're careful) I didn't want to chance breaking it.What is the vent tube insert they are talking about on the sale page? Is that necessary for install?