The problem is that the zinc used for galvanizing the threaded water pipes doesn’t get along very well with the copper. If you make a direct connection, these two materials will interact in a chemical reaction that will corrode the joint and eventually cause it to start leaking.
To safely connect copper and galvanized steel, you have two options. Since brass doesn’t react with either the copper or the zinc, one method is to make sure you have a threaded female end on both the copper and the steel pipes, and then connect the two by simply inserting a short threaded brass nipple between them.
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Neal Paskvan is a full time Realtor specializing in Downers grove, Darien,Woodridge, Westmont and Du page county Real Estate
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