Welcome to TFP! :wave: 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.
 
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