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Steam baseboard vent maintenance help
I'm unsure what kind of vent this is for a baseboard in a 1-pipe steam system. It looks like this

and I haven't been able to find anything similar looking online.
Have suggestions or equivalent vent products to suggest to use in this setup?
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Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
Specializing in Steam Heating, Serving the residents of New Jersey
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