I know that a dielelectric union is required when going from copper to black steel or galvanized steel but is one required going to Stainless Steel? A customer wants full SS ball valves in his copper lines.

A hot water heater has gav. Nibbles how long will a copper fitting last hook to is and how long will a dielectric union last how long have the dielectric union been out or made?

Do standard plumbing codes require dielectric unions on drain pipes?

What is the estimated cost of putting in a dielectric union in a crawl space with about three feet of clearance between a copper/galvanized joint from a licensed plumber? Thanks! Hammer

Which way is the best to connect copper to galvenize pipe... gal pipe to brass valve to dielectric nipple to copper..? Thank