Proper type of tubing for trans cooler lines?

TurboGLH said

Nycopp (nickel copper) is what I would use if I was hand bending my lines.

There's absolutely no downside to them, only pluses. No corrosion, easy to bend and flare, high burst pressure.

Trans cooler lines are low pressure, 30psi, but I wouldn't trust copper line on something critical. Steel rusts, and SS is hard to bend/flare.

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I say that there is at least one downside to Nicopp trans lines vs steel, and that is strength. I used Nicopp on some trans lines on a Jeep I put together. On an out of town fishing trip, with a boat in tow, the outer ring of my balancer started walking off hub and ended up tearing serp belt up. Torn fragments of belt whipped around and grabbed one trans line and bent it 90 degrees. Had to cut and repair bent, leaking line on side of road. I think a steel line would have been pulled out of place, but certainly not bent 90 degrees. No more Nicopp trans lines for me.