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IF YOU DO THIS "TEST" BE SURE THAT YOU DON'T LEAVE THE BLACK TANK VALVE CLOSED FOR TOO LONG. YOU RUN THE RISK OF RUPTURING YOUR BLACK TANK IF YOU "FORGET AND LEAVE THE HOSE RUNNING, FILL THE TANK TO OVERFULL AND PRESSURIZE IT BEYOND CAPACITY. In other words, be careful not to explode your black tank.....
Every RV that I’ve ever seen has a vent stack out the roof. The only way that you can over pressurize it is if your vent stack is plugged & you would have noticed your toilet gurgling back at you when flushing if that was the case. The worst that should happen is having a not-so-pleasant shower Coming off the roof.
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