Calling for help from DIYers

ImJustAsBad

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Yoooooooooooooo!!!! I have these iron boiler return pipes in my basement that are rusted. I need to change them to copper. How do I attach iron to copper without it corroding? I've been doing some research and people are say different thing. Some people say use a dielectric coupling others say use brass fitting. I don't know what to do. I'm so confused. I hope some here knows about this and can help me out.
 
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