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Our 2006 3400RL unit has the washing maching draining into the black tank which is a blessing at times. I like to leave the black water valve open and just use extra water to flush the toilet. We use the Kenmore washer nearly every day so it flushes the tank really good. If I didn't leave the valve open, it could mean a backup I don't wanna have! I do remember the tech guy telling us that this configuration has changed on the newer models.
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