Air-relief tube in the filter is just what you say, pipe with a screen. It does get covered with DE and debris, but air can still get through, normal operation.
Actually I looked the part up in the Pentair manual to be sure I was using the correct name before I posted. "170029 AIR BLEEDER ASSY., QUAD 60". The release valve on top is called "Manual Air Relief Valve". I know that most people refer to it as a breather tube, but I was just trying to use the correct nomenclature. Thanks for your response though!
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