Connecting copper and galvanized water pipes can cause corrosion due to dissimilar metals, or galvanic corrosion. A solution is to use a fitting called a dielectric nipple (bottom photo). A plastic liner (3 in. long) inside the fitting increases the resistance between the pipes and reduces the corrosion rate.
From The Family Handyman.
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Corrosion are common problem on our water pipe. We can prevent the pipes from corrosion by using electrical isolation.
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