Welcome to TFP! Those valves are all on the suction side of the pump, so they are pulling water. I suspect you have something like:
- One poolside skimmer; maybe two plumbed separately?
- Main drain
- Spa
- Dedicated port in the wall for a suction cleaner?
It would help if you updated your signature with all of your pool and equipment info. Maybe also post a pic of your pool itself. That should help.
Oooooohhhhh. Very nice. For the first (mystery) valve, you may have to just slowly open it and see what changes with water suction. Maybe each drain is plumbed separately?
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