Welcome aboard
Is you head a manual unit, has a manual pump handle on its side or a vacflush, push button flush?
If the latter it uses fresh water from the fresh water tank.
If you don't know either google it to see what I am saying or post a picture of what you have.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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