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When I use the black tank flush, the line seems pressurized when I disconnect. Water flows back out the convenience centre valve, like its draining from the high point. The force of flow indicates that the water was meeting reasonable resistance while I was flushing . The tank flush does seem successful as it does flush the tank. Is this normal to others as well?
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Gary and Sandra
Edmonton, Alberta, Canada
2015 GMC Sierra 2500HD
2018 Montana 3120RL
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