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Hi Steve, According to normal practices in NYC it is common to use “ONE COMMERCIAL SIZED” smaller pipe when going from Galvanized to copper.

The reason being we know ferrous metals will have a reduction over the years and NYC water being slightly on the acid side leaves coper in pristine condition even after many years of service.

Now according to the code I remember it did state any pipe passing through a wall, floor shall be protected by an Iron pipe sleeve, etc., with lots of goodies thrown in.

This sleeve was use to prevent not only the piping from carrying any structural weight but to protect it from the effects of cement etc.

Personally If I were passing a copper line through a galvanized pipe I would coat the copper with either coal tar enamel or what is commonly called Mil wrap (PVC or other tape.

Check your local code book and you cant go wrong


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