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Yes, correct. Actually a vacuum break is an anti-siphon device. Mine "failed" when the spring loaded seal stuck in the halfway position... neither open or closed. That allowed water from the black tank flush to flow up and out of the vent, flooding the bathroom. At least it wasn't funk water...
I tend to agree with pete'sMH... while they're required to pass plumbing code, they can be a nuisance on a MH... especially when they bury them hidden behind a wall! If they put in high quality brass ones with higher quality seals they might be more reliable.
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