freshwater tank leaking under v berth - SailNet Community

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Old 03-12-2010
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freshwater tank leaking under v berth

The boat is an islander 30 with a 25 gallon glassed in fresh water tank under the v berth. If the tank is full or we are heeled over the water leaks from the 6 " inspection port on top of the tank. The inspection port is a regular deck plate type with a flange, screwed to the top and bedded with marine sealant. Is there a better way to seal the opening in the top of this tank than a deck plate ? What kind of sealant would be better than regular silicone ? Should I use 3m 4500 ? Since I sleep in the V berth it is awful to get into bed and find the cushions soaked from below. And no I do not have bladder trouble.


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Old 03-12-2010
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Mine uses a rubber gasket with mechanical lock fastening. That would be my first choice as you will want to access it periodically.

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Old 03-12-2010
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If its the screw in type deck plate clean the treads and apply plumbers putty. If not there reasonably inexpensive to replace.
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Old 03-13-2010
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I would NOT use 5200 as you would never be able to remove it. Plumbers putty is a good choice or if you need to remove the housing, rebed with silicone, particularly if it is a poly tank as silicone is a good choice for those tanks and is flexible to handle expansion and contraction.

Tod
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Old 03-13-2010
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5200 also cures using an isocyanate compound and isn't approved for use on POTABLE water tanks.
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