I am trying to dewinterize my sprinkler system the first time in a home we moved into. After turning on the water to it from the basement, the pressure vacuum assembly just outside the house was leaking:
I'm totally new to this, but I understand from some YouTube videos that there's something I need to turn to pressurize this assembly. In most videos it is a ball valve or screw, but I don't see anything like that here. There is that spinning thing nearby, but I'm not sure what it's for.
Any ideas how to dewinterize this?
Here is a closeup on the gold lip:
There are model numbers there but they don't return anything on a Web search.