ANSWERS: 3
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good plumbing store will have a dielectric connector for waterheaters, they have the same issues - around 8-10$
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I would use something other than metal between the two. A short length of PVC should work well, and weatherproof sealing material should hold everything together, even in high wind.
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You can use steel, as long as there is a separator between the disparate metals. I work on masonry exteriors, and often use a self adhering waterproof meembrane around steel when it comes in contact with copper.
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