Jonathan, I appreciate your effort on identifying this pump and here is some more info on it. The word EATON is cast into the pump housing and not stamped. On a bolt head, about 11/4 inch wide, next to the high pressure port is stamped L G with the numbers 12170-5 below it and next to the low pressure port, on a bolt head about one inch wide, is the letter C that is underlined. There are no other markings on the pump except the ones that you can see in the picture. There is a little symbol and then covered with the white dye the letter 1.
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1811 Hydro
"Failing to prepare is preparing to fail".
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