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I'm glad I ran across your post. I have been trying to solder the brass fitting from a dielectric union onto a 3/4" copper pipe and failing miserably. I was told (apparently wrongly) that I should overheat the brass fitting and did so, getting it glowing red at least twice. Have I damaged the fitting beyond further use? Just how hot does it need to be? Hotter than a normal copper sweat joint?
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