The vacuum breaker is on the black tank flush. So unless you have water turned onto it, it's not the vacuum breaker unless they plumbed it wrong at the factory. Those are problematic, while at it I would remove it and replace it with a brass water inlet check valve.
Earl
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2017 Eagle 293RKDS, factory ordered, lots of mods and upgrades. More than I can list.
2018 Ram 3500 crew cab long bed SRW diesel 6spd Aisin 4wd Tradesman.
B&W Ram puck 5th wheel
Line-X premium
Mopar wheel to wheel steps
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