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Last week I returned a brass PV-2 valve as the rear port would not bleed. The second valve also would not allow brake fluid through rear port of valve. I finally put the rear internals from my old PV-2 in the new valve to get it to work. Maybe CPP has a bad batch of valves....I couldn't even blow air through the rear inlet unless I loosened rear section of valve.
Yes, both valves were "centered" ...
I certainly learned a lot more about P Valves than I really wanted. So maybe it was a good thing