Plastic/Aluminium according to the Nissens website.
This is something you probably should look into. Dissimilar metal corrosion will over time, and I don't know what type of period we are talking about, eat into the case, leaving you with some seriously bad engine problems.
I after some reading would suggest strongly that you do not use copper brass units. It would be a great cheap solution, but I cannot warrant a dead engine, and would rather make a bigger outlay on radiators.
Just my two pence, but I am interested on other peoples' input on this.
Al
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