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I have a 1885ish single pipe steam system. Burnham boiler. The building was built with a storefront and residential units behind and above the store. I'm having problems with the last 2 radiators in the run. (which is the coldest area of the building) one is 1st floor, the other above it. Its like 2 fins out of 11 get hot. when I open the 2nd floor valve and looked down the 1.5 inch pipe, I noticed a 3/4 inch restriction in the pipe that let the steam thru. This connection is under the floor and in the 1st floor ceiling. It looks like the pipe comes in at the ceiling of the first floor and goes up to the second and down to the first floor before connecting with a condensate return. On the first floor (which would be the last radiator) I drilled and tapped the vent hole to put in a 1/4 antler vent. It didn't seem to help. Does anybody know why this would have a restgriction in it? Any suggesation would be appreciated - Bill