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I have never had to raise the front or side to get a good drain. I have found it necessary to have the black tank filled at least half full to get good flow. The minor trickle I sometimes get at the next stop is no big deal, I wait til I am hooked up to open the valves.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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