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replacing strange air vents (1 pipe steam)


I just bought a house built in 1927. It has 1 pipe steam. A few of the air vents weren't working, so I picked up a box of Hoffman 1A vents and tried to replace the not working ones. I was able to replace 3 out of the 6 vents, but the other three don't seem to fit. The old vents didn't have a little toungue like the Hoffman, they have a fairly long curved pipe (maybe 3" or so long). Does anyone know where I can find replacements for these vents? Both kinds of radiators look identical.



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