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I agree, and the copper is the best at this game. The brass is a copper alloys, so it shouldn't be far from it on this point. I don't know about the wear resistance between aluminum and brass. I don't see a concern about breaking the brass part. The plumbing fittings are almost all made in...

No, Stig worries about the wear of the soft metals which change the part's shape and eventually impairs the function of your device, leading to some troubles (at least). Your idea looks fine to me. Just find a hard enough brass, I know there are many different brass alloys.