🔎 UNIDENTIFIED Old pressure cooker tops?

[savinghistoryalway.s]

One on the left was dug at a early 1900s farmhouse and the other one was dug at a revolutionary war veterans home both near Atlanta GA I assume early 1900s the items?

 

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[Erndog72]

Gas valves?

 

[ncsuwolf]

Something to do with a pressure valve, but don’t think pressure cooker