RE: Holding tank and water tank=which side for pump out and fill???
Typically your waste tank will have*two large diameter hoses going to it - from the head and to the deck fitting and a vent line going to the thru hull fitting (above the water line).
The water tank should have a large diameter fill hose (coming from the deck),*a vent line going to the thru hull fitting (above the water line) and smaller supply line going to the feed pump for your pressurized water system.
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