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John Arnold
10-24-2007, 05:01 AM
Does anyone know what this green liquid is? It's dripping from a relatively new flue liner, which has an 18 year old oil-fired furnace (with what looks like a large hole in the heat exchanger) venting into it.

Dom D'Agostino
10-24-2007, 06:43 AM
Green pipe dope or thread sealant?