The hose you're holding There is certainly the valve address ventilation and should be remaining open. Placing a filter on It might be good to prevent dust or particles entering into your cylinderhead... I'm undecided if why my battery displays below 12V contemplating its the third alternator I have set https://lanevwwuq.win-blog.com/12915608/blacktop-20v-4age-things-to-know-before-you-buy