A bilge pump is a vital marine device designed to remove accumulating water—known as "bilge water"—from the lowest compartment (bilge) of a vessel. They ensure vessel stability, prevent sinking, and protect components from water damage, operating either manually or via automatic electrical switches.

Key Aspects of Bilge Pumps:
Purpose: They remove water from leaks, rain, or waves that collects in the hull, preventing the vessel from becoming waterlogged.

Location: Installed at the lowest point of the boat's hull to ensure maximum drainage.

Types:
Submersible/Centrifugal: Submerged in the bilge, they use an impeller to push water out.

Diaphragm/Diaphragm Piston: Often used as "drying pumps," these can handle small amounts of water and often sit above the bilge, allowing them to remove more water than some submersibles.

Manual/Hand: Hand-operated, often used as a backup, particularly in small boats like kayaks.

Operation: Many modern pumps are automatic, equipped with a "float switch" that triggers the pump when the water level rises.

Bilge pumps are considered a crucial last line of defense in damage control and are often used alongside, not in place of, other safety equipment.