What kind of sealing ring does a Steamliner Model A pressure cooker use?

I bought a Steamliner Model A pressure cooker yesterday that needs a seal and pressure regulator. The pressure regulators are universal, but, Steamliner went out of business years ago, but, I know presto makes parts that are exchangeable with steamliner’s old equipment.. Does anyone know what model sealing ring or have a link to one that will work on this large pressure cooker?

all you need to know is the diameter, width, and thickness of the seal for a replacement.

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