Al and Cu can be used together as long as the mating surfaces are not in direct contact - apply a tape or a corrosion inhibitive compound on the threads, or solder the joints to prevent liquid ingress in the threads (might be tricky to solder the inside though). The use of an o-ring is a start but a seal to close the inner joint is needed too.
Anyway - some info. from my Materials Course back in my Uni. days.
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