What could this be?

[alabama11]

Hello all,
Thank you for viewing this thread. Found today a thing which seems to be lead.
2" in diameter
3/4" in depth
has 5 threads
has 8 nodes along edge.
Found along an abandon road which could date in to the middle 1800s.
Looks like a Sabot, but need expert opinion.

 

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[kcm]

I'd have to guess that it's a threaded plug from the days of using lead pipe.

 

[jewelerguy]

looks like old brass to me. given it's size in your hand, I believe it's an old radiator cap

 

[alabama11]

That makes sense with the threads on the outside surface.

 

[vhs07]

Looks like an old bung plug.