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No, I have replaced the valves on the black tank several times. Before I remove the valve I flush the tank out several times. Let it drain till nothing is flowing out of it then when I raise the front of the rig lots more drains out.
With the valve removed you can see that the drain hole is about 1/2 to 3/4 inches above the floor of the tank.
All I am saying is why not put the drain on the bottom of the tank where it belongs.
There is no where else, both in my home or the rig where the drain is not on the bottom of the sink, tub, shower or in the toilet tank.
Just saying is all.
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