Quote:
Originally Posted by gto4ben
I looked at all my AIR pump pressure relief valves, including two spares I removed from their housings, and could not find any codes stamped or inked. The poppet stops had different depths though. I measured the depth from the valve top to the inserted stop. The"U" coded pumps were deeper than the "A" and "C coded ones.
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Doing a quick search on eBay by part numbers, it appears that the relief valve and the plug were serviced separately.