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No, you cannot join copper and galvy directly. A brass fitting needs to be between the two to prevent electrolysis. You could also use a special type of union that has a gasket between the two halves. It is called a Dielectric union. If this junction is between pipes on your water heater and the cold water supply line, you could use a fitting made for that that also is a back flow preventer (ie a check valve).

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โˆ™ 2007-01-12 09:21:02
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Q: Is it safe to use copper and galvanized pipes on the same fitting?
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