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For purpuses of plumbing my fermenter I need to introduce a small piece of copper. The size would be equivelant to a mans wedding ring in a five gallon batch. Anyone know of any harmful effects on the fermentation with copper exposure?

I sure hope not

While I agree that mash is often made in copper mash tuns due to the good heating conductivity of copper, using copper in a fermentor just seems like an awful waste of money.