Here are some pictures of the project:
Here’s an old horizontal hot water line, 1/2″ - not much water getting through.

This is an old steel/copper joint. This is also why i added 3 dialectric unions where i had to join the two. The hole in the copper side was about 1/2 this size when i first took it apart.

Here’s a shot of part of the finished job. Much cleaner - i should have taken before pictures, it’s much nicer looking now!