An emergency drain, also known as an overflow drain or emergency relief drain, is a critical safety feature found in many plumbing fixtures, including sinks, bathtubs, and water heaters. Its primary purpose is to prevent potential water damage and flooding in case of a plumbing malfunction or blockage.When the main drain becomes clogged or the fixture overflows due to an issue like a blocked drainpipe or malfunctioning plumbing component, the emergency drain serves as a backup outlet to divert excess water away from the fixture. It prevents the water from spilling over onto the floor or causing damage to surrounding structures and belongings.Emergency drains are typically connected to a separate drainage system or floor drain and are often located near the top of the fixture. Regular inspection and maintenance of emergency drains are essential to ensure their proper functionality in times of need and to prevent water-related emergencies.