Hi Forest,
My holding tank is gray/black combined. I just dump it then flush the toilet a couple times with the valve open. Hose connections and "in tank" sprayers are sometimes employed for systems with black water only tanks.
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1993 Newell 45'#316, 1976 Trans Am 455, 1967 GTO, 1953 Chevrolet 3105 (panel truck),1952 Chevrolet 3600,1969 Airstream Overlander. Always fixing something!
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