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I have a Parker Fluid Connectors catalog in my hands that shows all the thread and port details and also port tapping tools. The name and address on the book is
Parker Hannifin Corp.
Tube Fittings Div
3885 Gateway Blvd.
Columbus, OH 43228
ph: 614-279-7070

I bet you could find drawings on line someplace but I've never searched for it.

I don't know why Earl's fittings would be different, I think AN is AN so probably the same as Parker; the fitting mounting threads are 3/8-24 for -3; 7/16-20 for -4

Don't cut metal til you confirm this since I'm not a fitting expert, just looking in this catalog.
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