What was this thingy-mickbobber

I found this is the most claustrophobic crawlspace I’ve ever been in. This building is 1940’s or 50’s and use to be a hotel. under each unit i found one of these things. Any ideas what it was for? It makes no difference to my report just curious about the past.



My wag is old fire sprinkler components.

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Another WAG would be a control for a Boiler heating system.

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Maybe some sort of valve for an old radiant heater system. Allowing each room to set their own temp?

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