This pump is very suseptable to cracking right where that aeorquip pipe to -6 adapter is. Regardless of the brand, they are all made from that zinc pot metal alloy right there on that extension.
It may have been fine when you installed the adapter but they can and will crack over time, sometimes needing a magnifying glass to see.
I speak from experience on them.
I have cracked three that I can remember, and my memory isn't that great anymore?
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