Is a diaelectric union required when piping from black iron to stainless pipe

Check out this thread and decide for yourself... ;)

https://www.askmehelpdesk.com/plumbing/joining-black-steel-stainless-dielectric-union-182952.html

Be sure to read the entire thread, OK?

Mark

No, they are not dissimilar metals.. SS, depending on the alloy contains a variety of other metals. What are you using, 308,314?