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To be the safest, I'd take the rubber hose off and plug that elbo. Then I'd cut a plug to knock into the mushroom thru-hull from the exterior making sure that it does not reach the gate valve inside. Winterize your system and address the thru-hull and new valve at spring haul-out.
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“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
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