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Replacing steam boiler main vents

I have an old single pipe steam system in a two story colonial in New Hampshire. I have been trouble shooting some noisy pipes and have been able to replace most of the radiator valves. But I also found 3 old Hoffman No. 2 (1/8") valves on the mail lines in the basement. They are in really bad shape but of course you can no longer buy Hoffman No. 2 valves. They look like regular angled radiator valves but I assumed the main line requires a different valve than my radiators. Can anyone suggest what type valve I should replace these with?

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