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There are a vast amount of styles and threads used for hydraulic fittings. I would buy what you think it is and go try it on HIS fitting before welding. He may know what it is or get a picture of the male end and post it. Normally a NPT TAPERED thread will thread in easily 3 to 31/2 turns by hand . Straight threads keep going until none left showing.
That coupling doesn't even look like you could make 3 trns into it.
 
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