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The pipe threads have likely corroded, and you may damage them during removal or reinstallation. Then you might need a plumber to cut new threads on the existing pipe and/or replace the shutoff valves before you can run the heat again. (If your 100-year-old valve seals are like mine, they are far gone.) much better to leave them alone. If you are really concerned about people inspecting your mud/paint job behind the radiator, buy or make a radiator cover!