What is this thing?

Not that I've seen, but I'll look around more tomorrow. Could it be in the basement? I noticed two odd looking valves down there.

If so it appears to be capped, or at least I assume that's what the slotted thing is screwed into the nozzle looking part.

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Or could be a return from the pump to spray water to aerate and cool the water (and raise the pH)

That's an interesting idea. The return from the pump splits into two pipes going into the ground, one of which has a valve that is currently turned off.

 
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