Re: An #3 steel union
XRP 900133.
Also the industry interchange number for a 37* JIC female flare swivel is 6565. Your part would be 6565-03-03 at hydraulic supply places. Actually found one on ebay if you do a search for that number.
These are all swivel fittings. I'm unaware of any solid female 37* unions without some serious searching. Doesn't mean they don't exist.
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