You only have two handles, one for the black tank and one for the grey water tank. If the kitchen sink will not drain, you have a blockage under the sink. Just like a house you have a trap and you can unscrew them and check for what is stopping up the drain line. They are the white plastic pipe and no tools should be needed.
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2013 Tiffin Allegro 34 QFA
2015 Cadillac SRX (towed)
2019 Tesla Model X
1991 Avanti Conv
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