Designed to insure an uninterrupted gas supply for all your RV appliances: Pilot lights, Refrigerator, RV stove, water heater & other vital systems. The "remote sensor" recognizes when the regulator has "changed over" & is drawing from the second cylinder (reserve). The sensor signals the "indicator box" located inside your RV to start "blinking", alerting you that the main cylinder has emptied.
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