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by Evan W.

It is 2 stage / 4 cylinder; no obvious patent number visible, a hand stamped number ” A 16434 “.

It has barely legible casting numbers that kind of look like ” 433 – 158 “; and a casting logo that barely legible says “United Stated of America” … that’s it.

Who mfg. this pump?

Will appreciate your wisdom. Thank you.


sr.engineer at techemail dot com



Evan, images went missing in the site transfer. If you get the chance, would you please provide them again in a comment below?