Plumbing addition

[Pap and Mimi]

So I plumbed my black tank flush into the plumbing in the basement. Vacuum breaker is still in place plus I added an inline check valve just for extra safety.
Planned on adding a picture of the valve, but don’t see a way to do it from my phone.

[FT4NOW]

The check valve defeats the purpose of the vacuum breaker. Water actually needs to he able to backflow out of the inlet to drain the line out.

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