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Bilge
The bilge is the lowest compartment on a ship, below the waterline, where the two sides meet at the keel. -
Bilge pump
A bilge pump is a water pump used to remove bilge water. Since fuel can often be present in the bilge, electric bilge pumps are designed to not cause sparks and are typically fitted with a float switch, which turn on the pump when the water in the bilge rises above a pre-set level.