I use one of those and it works great. For me I backfill the black tank with hose water, and then you can open that blade valve and flush out the black tank. You could then just leave the hose water running to clean out your accordian hose.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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