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The vacuum breaker is a code requirement to prevent back flow of contaminated water into a fresh water source. It has to be higher than the black tank and that’s why it’s routed like it is. Unfortunately most times the device used is very poorly constructed and of cheap plastic. They fail easily all by themselves and they also can retain water and be damaged by freezing since most folks don’t think to blow out the flush line when winterizing- as mentioned above. They do make a much higher quality brass version but there is a better solution. Just abandon the thing altogether! In my case, after a soggy messy failure I was able to locate the PEX lines in the basement where they turned to go up to the vacuum breaker and where they came back to resume their pan to the tank. I cut the breaker loop out and just joined the lines together with a shark bite one way valve. There is ZERO risk of contaminating anything and the solution was cheap and easy. I recommend it.
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