The NiCopp or Cunifer brand tubing isn't pure copper, it's a nickel-copper alloy. It's relatively new in the US but has been used for years in Europe for brake lines as well as fuel lines, so it has the ability to handle high pressure. The big advantages over steel are it won't rust, and it's easy to bend and flare. It is DOT approved, if you're going racing I suspect it's probably OK but check with your sanctioning body.
edit: when I say 'relatively' new, it has been available in the US for probably 20 years now; it's just that it's been in use in Europe a lot longer than that. I believe it's OEM on Porsches as well as some other makes, so it's most likely OK for competition use.
Last edited by Stuart; 05-09-2021 at 10:32 AM.
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