How to remove air vent slug from new OCS Cast Iron Radiator

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New York City
I just bought three new OCS Cast Iron Radiators to replace some broken ones in my house.
The way they came new from the shop, there is a little plug filling the 1/8" threaded tap where I need to put in the air vent.
I can't figure out how to remove this plug. Is is threaded? What can I grab on to? There's only a small curved ridge exposed.
There must be some trick that I'm missing.

Hey, wait a minute.

This is awkward, but...

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