Steam Radiator thread sealant?

Is there some sort of thread sealant that should be used when hooking up steam radiators?
Thanks, John
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fnord wrote:

On the faces of the union? They were intended to seal without any sealant, but on an old system you can put a thin film of pipe dope or even RTV on them.
On threaded parts (nipples)? Yes.
Jim
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Teflon tape and/or pipe dope
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Yes.
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Larry Wasserman Baltimore, Maryland
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