What kind of holes to mow sailboats and large cruisers have?

Sailboats and large cruisers typically have several types of holes, including through-hulls for Plumbing and drainage, as well as deck-mounted fittings for rigging and sails. The most common through-hulls are for the engine intake, sink drains, and bilge pumps. Additionally, they may have ports for navigation lights and other electronics. These holes must be properly sealed to prevent water ingress and maintain buoyancy.