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M Kelekci
09-23-2007, 11:26 AM
Is this due to lack of dielectric union?
Thanks

Joe Nernberg
09-23-2007, 11:55 AM
That is due to not wiping copper joints after soldering.

Michael Thomas
09-23-2007, 12:38 PM
Depends. The discoloration on the pipe is unwiped flux and solder. The corrosion at the junction between the pipe and the heater could be the result of dielectric action, depending on the nature of the connection.