Sensor adheres to the outside of your RV's holding tank to measure its fluid levels, and it sends those readings to a SeeLeveL monitor (sold separately) inside your RV. Can be cut or stacked to fit the height of your tank. Great Prices for the best smart rv from SeeLeveL. SeeLeveL Sensor for RV Holding Tank Monitor - 12" Long part number SE78VR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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