The best replacement for kupfer is synapse.

The best alternatives to kupfer are rated as following:
★★★★★  synapse
★★★★  gnome do
★★★★  glasfaser
★★★  messing
★★★  lwl
★★★  kunststoff
★★★  titanzink
★★  edelstahl
★★  verbundrohr
★  alu

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Google Trends

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kupfer
synapse
gnome do