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After removing the inoperable valve from his Racor filter, Dan tapped new threads, far left, and inserted a nylon hex-head bolt with an 0-ring seal, at left.

A bolt replaces a faulty valve Issue 94 : Jan/Feb 2014 Though I have never seen any of this described, I have been having terrible problems with the self-venting drain valve on 500 series Racor filter...