A Vented loop should be mounted a Minimum of 250mm (10") above the waterline and the higher the better especially in the case of a yacht where the height to waterline can change when the vessel is heeling over.
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A Vented loop should be mounted a Minimum of 250mm (10") above the waterline and the higher the better especially in the case of a yacht where the height to waterline can change when the vessel is heeling over.