What defines an installed toilet on a vessel?

An installed toilet on a vessel is defined as having a fixed plumbing and piping system. This means that the toilet is permanently affixed to the vessel and is connected to the vessel's plumbing systems for water supply and waste removal. Such a setup ensures that waste is properly managed in accordance with maritime regulations, including the safe discharge of sewage when appropriate.

In contrast, a portable toilet system does not qualify as installed because it can be moved and is not connected to the vessel's plumbing. Toilets used only in emergencies do not serve the routine sanitation needs of a vessel and may not have the necessary components for standard operation. Lastly, a device for chemical waste treatment refers to a system designed to manage waste rather than the toilet itself. Thus, the definition clearly points to a toilet that is integrated into the vessel's infrastructure, which is characterized by its fixed installation and connection to a plumbing system.