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I have never seen any RV gray or black tanks with any kind of check valve to release its contents on to the ground it is against the law to do so that is y when the tanks get over filled it backs up into the sink or shower. you still have a problem some wear and need to
have someone else take a look at it.
Bob & Carol
Washington St
2917 352RL 2008 Dodge 3500 DRW crew cab 4x4 LB 6.7L
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