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Larry-- I would do DQDick and dieselguy have said but I myself would not leave the gray tank dump valve open. Besides causing the sewer line to ice up when it is cold enough for water to freeze, you also stand a chance to get two things into your unit: 1. sewer gases from the sewer line and 2. the chance of getting sewer flies into your tank and unit via the open sewer line. I would turn on the faucet early before retiring for the night and see if the sink starts to fill or possibly let another faucet drip(possibly the kitchen sink).
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