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Dissimilar metals in contact to each other cause a Galvanic Reaction resulting in one or both metals corroding and causing a leak. A Dielectric Union separates the two metals by uses of rubber and/or plastic thus preventing a Galvanic Reaction. Also in most Plumbing Codes, you can use a Brass fitting in place of a dielectric union as Brass does not react with Copper or Steel Piping (Galvanize Piping).

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Q: Why Using a dielectric union to join galvanized and copper water supply pipes?
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Related questions

Can you connect copper to galvanized using only a bronze fitting?

There are copper fittings that will connect to galvanized.


Can you connect copper to galvanized by using a bronze fitting?

Yes! The best copper-to-galvanized connection is made using a brass nipple in between the two dissimilar metals. The nipple should be a minimum of 2 1/2" long (preferably six inches long). Bronze is an alloy (copper + tin). Brass is an alloy (copper + zinc).


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Commonly, they use zinc, copper, chrome or nickel for that.


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When using SMAW ("stick") welding, galvanized steel can be welded in the same manner as uncoated steel. ... The thicker the zinc coating, the more fumes are generated, and those fumes have to be able to escape easily into the atmosphere and not be forced through the liquid weld metal.


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try using galvanized-- large head 1- 1/2 inch long


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When connecting interior PVC pipe to the galvanized pipe from the meter is there a possibility of major pressure loss?

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