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Old radiator vents smaller than 1/8"?
I have an old 5-tube, 14-section Weil-McLain radiator in our rental apartment that I *think* is a Cameo model. It's connected to a steam heating system. Our new tenant just turned on the heat for the first time this season, and she noticed that there isn't any vent valve on the side of the radiator -- just a hole -- and so it's turning her living room into a steam room.
Here's the odd thing. All of the other radiators in her apartment and in ours have vent holes that accept a standard 1/8" vent, but this hole is smaller -- between 1/16" and 3/32". I didn't have much luck searching online for replacement vents in that size -- it doesn't seem like anything smaller than 1/8" is available out there. Is there any way to figure out what type of vent fits this radiator hole? Or is searching for replacement vents a fool's errand, and should we be doing something else, like fitting an adaptor to this hole so it can accept vents of a more standard size?
Thanks in advance for the help. I searched through the forum quite a bit before posting, and the threads provided a great crash course in steam heating.