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How to connect ductile iron to copper pipe

How to connect ductile iron to copper pipe

How to connect ductile iron to copper pipe

(OP)
Need help.  I have a 4" ductile iron pipe, class 53, for domestic water use coming from the downstream side of a backflow device.  It needs to be connected to a 4" copper pipe, type K for on-site drinking water use. Specifically, what technique should be used to connect the two for cathodic protection?  If you have a certain manufacturer and model of a part that would be very helpful.  

Canman

RE: How to connect ductile iron to copper pipe

You should electrically isolate both sides.  A short connector piece of PVC could work, or you can use insulating flanges and bolt washers.  Just make sure that both sides are connected to the same  conductive support--should have high resistance across the two flanges.

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