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Well most of these are NPT so I am thinking he might need to open it up to .84" for best fit (1/2 NPT). Not sure if that even has a groove for a viton ring or not, but its at least somewhere to start.
https://www.suremarineservice.com/Hardware/NPT-Brass-Thru-Bulkhead-Fittings/FIT-693.html
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