Black Water Tank San-T- Flush Vacuum Braker Leak

Of course it leaks, it says so right in the instructions:

Catalog

ATMOSPHERIC VACUUM BREAKER/
CHECK VALVE
(571 Vac Chk) must be 6” above flood
rim of the highest fixture connected
to the wasteholding tank. (ASSE
1001-02; device shall not be installed
where the venting of water from the
device during normal functioning will
cause damage.


I simply eliminated the stupid thing. Just made sure that there was a check valve in the outside hose connection.