There isn't one. If you are hooked to a water source, you can turn the valve in the center from normal flow position to the tank fill position. If you aren't hooked to a water source, then you can utilize the winterizing inlet to do the job. Refer to previous posts on this or someone will come along to give you details on how it is done. John
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2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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