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Yes they do work. I had to use it on a copper pipe joint. I had to replace a hot water heater. The shut off valve was old and would not completely shut off the water. It continued at a rate of a drop every few seconds. As a result the steam was blowing the solder out of the last joint. I eventual wrapped that joint with the pipe tape. It is going on two years and no issues. I think the self sealing tape will work fine on a condensate drain.
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