School yard find

[AU24K]

Found this yesterday in a schoolyard of a school that isn't really very old. The pictures describe well enough. The quarter is for size comparison.
What is this and what was it used for?
Thanks.
Scott

 

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[SHERMANVILLE ILLINOIS]

Holes in it? Hollow? Moving parts?

Clould it be a lawn sprinkler head?

Nice quarter

have a good un..........................

 

[Eu_citzen]

Some thing to play chess with??

 

[aa battery]

It looks like it was used to regulate something

 

[AU24K]

It's not hollow and has no holes.
The school is only about 30-35 years old.
Scott

 

[dg39]

Is the middle threaded? Some type of on - off valve if it is.
DG

 

[AU24K]

There is no threads on it at all. It looks like it would have been part of some type of regulator and possibly sat on a rubber(?) seal in the middle area.
Scott

 

[Charlie P. (NY)]

It's obviouslt knurled for finger grip and slotted to key into another part to twist it only finger tight. Might have had an "O" ring or gasket in the central slot or a retaining clip.

Fuel shut-off knob for a tractor?