Our hydrants are off all the time. Spin the caps off and nothing comes out.
You need the large wrench to turn it on. Everybody here seems to know that. The Public Works people even have a wrench in the truck so they can flush lines.
Open that line and you ain’t getting anything in. Too much water pressure.
All hydrants are like that. What they must be talking about here is a second valve buried beside the hydrant that needs a second, and special tool.