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Second pipe sticking out of floor next to a one-pipe radiator?
This radiator is on the third floor of my house. I believe it is original to the house. There is a similar setup in the next room over, although that radiator has been replaced with another one-pipe steam radiator that’s larger.
The question is... what is this second pipe for? I initially thought it was a return for a two-pipe system, however as I looked at it, there does not seem to be a separate return to the basement. There also does not appear to be a separate return in the wall leading to this radiator, however confirming that would demand opening up the ceiling.
My second thought was that it was a riser vent. That would make sense it being on the third floor. But why would there be one in the room next door as well?
The pipe is 1/2” with a reducing coupling down to 1/8”. The vent on the radiator is a Gorton #D.
Any thoughts? What should I check next?
Homeowner from Providence, RI
Home b. 1897, one-pipe steam with a indirect gravity hot air system using Gold's pin radiators.