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How do I repair/replace the large nut on a Cast iron Radiator in my Dining Room.?

Nut on Cast Iron Radiator is cracked. How do I repair, replace?


I assume it can still be removed. It is going to be far better to replace if you can find it. Just take it with you and have them match it. I would try hardware supply, plumbing supply stores. If you cannot find it you will need a machine shop to

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