I'm hoping someone can help me.
Last year I had a new hot water heater installed.
They connected the hot water heater to the existing galvanized plumbing (my house was built in 1942).
I understand the use of the dielectric union as seen in this actual picture (Picture One) from my house:
What I don't understand is that the fitting (circled in green) in the next picture (Picture Two)seems to be going directly into the galvanized pipe, but it looks like copper (I thought that was incorrect):
Here's another connection with the same fitting (see Picture Three):
So what type of fitting is in pictures TWO and THREE?
Any help would be appreciated since I'm going to start replacing the galvanized myself with copper.