Over heat protector questions.

["Adam Price" <acprice1@xxxx>]

I am trying to make my own overheat protector and I was just wondering if 
copper is okay to use? All I can find are copper fittings, so will the 
copper react with the aluminum or the antifreeze in a harmful way?
What type of fittings are sold with the overheat protector kits?

Thanks,
Adam

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