Come on! That sucks! I have been all over this pump and I swear there are no numbers on it. I see Pat Pending, AC RPD, Made in USA and that's it! The bolt on the dome has a 1079 on it. Opposite side bolt has a triangle and 2. I scrubbed the flange and do not see anything either. This is very frustrating.
Edit: Here are pics of what I have found on the pump.
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