Can you ID this part?

[TFPJules111]

Anyone know what this is?

[attachment=0:26jnlik2]IMG_3263.JPG[/attachment:26jnlik2]

I found it stuck in one of the return eyeballs.

I've done seal maintenance on the pump, pretty sure it's not from in there.

The valve on the filter is only a couple of years old and works fine, so I doubt it came from there.

The only other piece of equipment is an old Jandy valve, but I'd think if it had broken loose from inside of it, it would have been caught in the inline filter on the pool cleaner line.

 

[TizMe]

How big is it ? Can we see a pic of the other side ?

 

[Bama Rambler]

Stick a ruler in the pic somewhere so we can get an idea of size. The fact that you found in the return tells us that it's smaller than a bread box. Also give us an idea of the equipment that's in your system. You mentioned a few but a list would be nice.

 

[frustratedpoolmom]

I wonder if its some sort of adapter part to hook up a fountain or something?

 

[Pool Clown]

With out a reference, It looks like a flow switch flapper, Or something out of the heater

 

[Bama Rambler]

A flow switch flapper is the first thing I thought of too.

 

[TFPJules111]

It's about 1" x 1". Back side looks the same as front side.
The jagged bit at the bottom is where it must have torn off from whatever it was attached to.

The setup's pretty simple. No fountains or water features or heater.

Equipment:
Hayward 300lb sand filter with multiport valve on top
Pentair Whisperflow 1 1/2 hp pump
Jandy valve with "energy filter" on pool cleaner output
3 eyeball returns + pool cleaner fitting
Main drain & skimmer

I re-plumbed when I replaced the ancient cartridge filter a couple of years ago.
There was "T" fitting in the return line with a small port on the side and a capped port on top, as well as some kind of disconnected Ionizer control box that I immediately ripped out (who needs those gimmicks with BBB?) - so the idea about a flow switch may be right on.

No problems with the pool, just curious what this piece of metal was doing in my return.

Thanks for your guesses & insights.