u/FindingOk2796

This system was installed professionally about 16 years ago. I’ve replaced a solenoid once, maybe twice, but never this zone, and knowing next to nothing about it, it never occurred to me that there was anything wrong with this, until that zone didn’t turn off one day. I went to replace it and correct me if I’m wrong, but is the top one a Rain Bird and the other two Hunter? Why on earth would they install it that way? And how do I replace the solenoid?