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Major leak between valve and rad--what to do?

I have a one-pipe system and a leak in one of my rads. The horizontal pipe between the valve stem and the rad has what looks like a large nut or donut on it, an inch or so from the upright stem. Water is leaking out from under this nut. I can't tighten the nut; it won't budge. I take it I need a plumber.

(It's a serious leak; it has ruined the paint on a square foot of wall downstairs and the wood in the floor around the valve is rotting. This rad had a cover over it and it looks like the leak began a few days ago without me noticing. I did notice, however, that my boiler was needing refilling too often.)

Until I can get a plumber here how can I stop this leak? I tried turning the valve but it's stuck, even though it's pretty new. It's a Groton vapor equalizing valve #5. If I can turn it halfway around, it will stop the leak, right?

Or should I just turn off the valve? I've read We Got Steam Heat and I seem to remember that turning off the valve is never a good idea.


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