Tony,?
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The sink itself is well above the waterline while at rest. On a hard port tack, you may take some water into the sink. As for the shower, I believe the strainer and shower pump act as a one-way valve to keep water from backfilling the shower.?
Hope that answers your question. Do you have a 402? You might want to check your layout.?
Best,
Jordan
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S402-047
formerly S36-087
Lake Michigan
Jordan