Thread: Proper dielectric fitting

Hi guys,
This is a connection between a copper drain pipe and the cast iron waste stack. It appears there is a proper brass di-electric coupling there, but I am not sure. Your opinions? Thanks.

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Looks like a standard copper reducing coupling installed into the cast fitting with lots of __it oozing out. Needs repair.
I am not aware of anyone installing a dielectric fitting from copper to cast.

What Markus said. If the joint is sealed the old way, first, a thick cord or 'oakum' is wrapped and pounded in around the copper pipe and then lead is poured into the gap between the copper pipe and the cast iron. So the copper doesn't come in contact with the iron.

That could be a brass fitting on the end of the copper, but it doesn't need to be, AFAIK.

What's that brown stuff? Did ya taste it?

DWV copper used to be a commonly used material. It was properly connected to cast iron, galvanized steel, glass pipe, asbestos cement pipe, clay pipe, and more recently pvc/abs plastic piping thru a variety of acceptable approved fittings/methods. Di-electric connections are not used on drainage-waste-vent system connections.
John The Plumber

The joint appears to be leaking, so it is not a sealed joint anymore. That brownish ooze is most likely waste. Almost no one does lead & oakum anymore, for good reason. Can be replaced with a rubber" no hub" type connector or the rubber donut that fits in the pipe. In any case it is a leaking joint with health concerns.