I’m hitting the usual brick wall that you always hit when using pressure pipes (against all better judgment). In Civil 3D 2021, they don’t yet have the glyph to flip the reducer around 180 degrees, but has anyone created an API backdoor via Dynamo to do this?
It’s better to update Civil to 2022.2 as it was fixed the flip glyph issue.
Not an option at this point in time.
I guess the workaround is to create a reducer and its opposite (enlarger) in order to be able to use it in pipe runs. For example a reducer of 200x160mm and its enlarger is 160x200mm.