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This size works efficiently up to 50 gallon holding tanks; Please stick 2-3 pads to your tank if it larger than 50 gallon. If two or more heater pads are to be used they must be connected parallel. Red Wire = Positive(+), connect to RV power wire; White Wire=Negative(-), connect to RV negative wire; White wire end with connector can be wired to the metal frame on your RV/Camper, if your RV / Camper do not have negative wire







