Ours doesn't have the gravity fill either and the manual says to add the bleach/water mixture, using a funnel, pour it into the water tank vent/overflow. Ours is located on the same side of the trailer as the service centre but at the back. Take the cap off,it slides on to some clips and it lifts off, take out the water screen, and insert funnel.
I actually used the winterizing system and sucked the bleach mixture with the water pump. Not sure if the mixture got into the fresh water tank or just the lines going to the fixtures. I will use the above method as described in our manual the next time.
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Bruce & Lori & Charli our 60# lap dog
2017 F350 Lariat, 6.7L, 6 1/2' box, Reece 18k Elite
2015 Mountaineer 331RLT, Dual pane windows, Dual A/C, Fireplace, 5th Airborne Sidewinder, Sailun tires.
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