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John,
One of the advantages of that lower tube is it drains the splash well when out of the water. I have an interest in the tube that goes between the splash well and the livewell/fish locker. Mine does not have one and I am interested at what height yours is at. I have been toying with installing one. My livewell/fish locker has a plug in the bottom and a drain access from the splash well to the locker would take care of gravity loss of water when dry docked. I have the live well deck off right now and have clean/easy access. It would also allow my transom's bilge pump to remove water from the locker. You really need a transom bilge to keep the deck dry.

Garris