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i'm not familiar with the Post... usually sinks are high enough over the water line to prevent water from coming back in like it would on a heeling sail boat.
have you checked the hose goign go the thruhull or sea chest? is it possible that another device is Tee'd in the line and when it comes on it back flows? bilge pump, Air Con pump, etc... it's never a good idea to Tee in a discharge but you never know what a previous owner (or builder sometimes...) may do.
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