I have a boiler with old and new radiators. On my newer copper lines there is this valve and I need to know what is is. I'm trying to cut off water circulation to a specific room (there are two rooms using the new copper lines). I also have a heat pump in his house and it works fine except for one of the above rooms. It gets very little of the forced air. If I can use the boiler to heat this one room (it conveniently has the thermostat in it) I would be happy.
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