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I've plumbed my last two boats with the same set up, recommended to me by Ocean Link, based in Rhode Island. The head goes straight to the holding tank, no Y valves. The tank has one discharge line to the deck fitting, one discharge line to a pump for overboard discharge. This system works great, no extra parts to fail. The other beauty of this system is the tank design. All hoses enter the top of the tank and are connected to PVC pipe that internally goes to the bottom - they call them dip tubes. This prevents sewage from standing in the hose - a major source of bad odor.
Good luck.
Skywalker
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