I bought a new, aluminum radiator, that came with a plastic draincock.
Is it OK to change this for a brass one?
I see lot's of new radiators on offer with brass petcocks, but I always was thinking that brass and aluminum don't match?

 

That is correct: the aluminum will corrode violently. I'd stick with the plastic.

 

OK, but why come almost all new aluminum radiators with brass draincocks..??

 

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0Tom@Dewitt
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Brass and aluminum are in the same family, non-magnetic and they do not react with each other. People have been using brass drains in aluminum radiators for years without a problem.

 

As most aluminum radiators are equipped with brass petcocks and obviously without major problems, as far as I'm aware, I ordered a brass draincock as well.