The normal stuff is perfect for me BE, I'd given up on finding any here and was planning on using brass from an old clock case (not that old!), I can't even get hold of copper stock!, I'm using a cold plate from my maze3. I'll have to replace it with Alu if I find a TEC PSU
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I'd of used plain copper pipe for the inlet, it's easier to shape with a pair of thin~nose pliers to a 'squared off' shape at the bottom, and less likely to deform/squash along the whole lenght, also silicon tubing does'nt need any ridging for grip, IMO, it mates better to a smooth surface...