Some models have a sink connected to the black tank by design. My outdoor kitchen sink is plumbed that way as its closer o the black tank. The outdoor sink is on one side of the exterior bathroom door and the bathroom sink on the other side. I guess separating the 2 saved Keystone 3' of pipe and 3 fittings and a couple of min. worth of labor.
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Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
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