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Hello Sue, congratulation on your daughter’s riding awards. I found out the sink in the 3400 drains in the black tank . This is done to prevent the toilet from stopping up the drain pipe with paper and stuff. Having the sink draining in the black tank gives more running water to the drain pipe for flushing purposes. I found this out when I left the sprayer hose on . Waste came out of my bath room sink and on the carpet. All of my carpet had to be replaced in the bedroom.
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