I don't do much with copper at all. I do know about the problem with female couplings though. I avoid that whenever possible. I'll use a threaded coupling then a pvc male adapter. I also know about electrolysis. You shouldn't connect galvanized directly to copper. I was wondering if a brass threaded coupling would be ok. Brass and copper are very similar. Look at this chart.
http://www.assda.asn.au/asp/index.asp?pgid=18533
There's my two cents.
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I realized about 30 seconds after posting this that duh, of course copper and brass go together. You see it all the time. Pressure regulators, gate valves, ect..
If I can't fix it, it's broken!