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Old 09-01-2017, 09:23 AM   #3
riverofcode
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Join Date: Jun 2017
Location: Fredericksburg
Posts: 53
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It is likely a heating mat that is stuck to the side or bottom of your black and/or gray waste tanks. I had them in my previous RV that had exposed tanks underneath. To make them more efficient I layered 1" rigid foam insulation on the tanks.

Scott
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