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X2 what Traveling Texan said about the sag in the sewer hose to form a p-trap. Also my unit has a front bathtub (lots of gray water!) so I leave both grays open.
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'19 Chevy 3500 High Country DRW
'18 Montana 3921FB Aggie ‘77
('17 Laredo 330RL previous RV)
In the sticks near Austin TX
Aussie Gus+Texas Heeler Jimmy
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