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Old 11-12-2017, 02:38 AM   #3
Leisure Time Larry
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Join Date: Nov 2017
Location: Black Hills, SD
Posts: 137
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The bathroom sink on my 5211 drains to the black tank. Try this... With the water pump OFF, hold the flush valve of the toilet open and pour a pitcher of water down the sink. If it drains into the black tank, you should/may be able to hear it, especially if your toilet is directly over your black tank like mine is. Good luck.
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