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- Interlachen Fl.
That is your air bleed screw or where you would hook up pressure gage. You need to fix this fitting.Yes the one you have with the red around it... It had some air bubbles coming from between it and the filter head so I tried to tighten it well the top part snapped off and then i tightend the bottom of it and no more bubbles from it. I was just wondering what its main purpose was and to say its now broke but not affecting anything ( that i know of ) Because I can put my hand/thumb over it and it has no psi/vac and nothing changes