Dear All, Happy Holidays !

I came across the following situation.

I need to build a copper manifold connected to bunch of 1/2" black steel nipples. Building a steel manifold is inpractical/impossible.

Should I go from the black steel to the copper directly?
Or should i go from the black steel, to a brass coupling, to the copper?

A galvanised cuopling seems a no-no because the zinc from the galvanizing will act as an galvanic cell and increase the speed of corrosion on the steel.

Any recommandations are highly appreciated.

Zinc will protect steel from corrosion. Put plastic between the steel and copper pipes to interrupt the circuit if corrosion is an issue.

I checked some literature on the website of the Copper Institute and it seems like the pipe dope with teflon will interupt the electric circuit enough to slow down this form of corrosion.