33RBTS combining gray tanks

[gunner18]

I have a 2020 33RBTS and I purchased the add on sewer valve so I can shut the valve at the discharge and open both gray valves as to make one large gray tank but my gray tanks do not level out and one continues to fill before the other. Is there an anti flow back valve? I have a friend with a 2020 eagle 5th wheel and this same setup let’s his gray tanks combine.

[NewBlackDak]

Originally Posted by gunner18

I have a 2020 33RBTS and I purchased the add on sewer valve so I can shut the valve at the discharge and open both gray valves as to make one large gray tank but my gray tanks do not level out and one continues to fill before the other. Is there an anti flow back valve? I have a friend with a 2020 eagle 5th wheel and this same setup let’s his gray tanks combine.

Water runs to the lowest point. If one tank is is mounted higher(or isn’t as deep) it’ll run to the other tank first.