Water hose hookup on fresh water tank/black water flush port

I have a question regarding the fresh water attach point on our Winnebago Brave.  When dumping the black/gray water tanks prior to departure, can I switch the fresh water hose to the black water tank flush port, or do I need two separate hoses?

For Use with Stock Fresh Water Tanks

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This Accessory hose kit includes all the hoses required for use with a standard fresh water tank. (1) Water fill intake with large hose fitting and

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