Brass to copper
On the statement that a plumber advised that soldering brass to copper is problematic: Brass is merely copper alloyed with zinc. They solder together quite well. Plumbers use soft solder only, which will still work. Hard soldering is brazing with brass rod or even silver, and is the best as it is at a higher temp and will not decay. The copper must be very clean, as it oxidizes quite fast.
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