The Shoreline Marine SL52172 Drain Twist Plug is a reliable and durable 1-inch drain plug designed for use in boats and other marine applications. Constructed from stainless steel (Ss), it offers excellent corrosion resistance in harsh saltwater environments, ensuring a long lifespan. The twist-style mechanism allows for easy and secure opening and closing of the drain hole, providing a watertight seal when closed to prevent water from entering the hull. This plug is a standard size for many boat drain openings and is essential for preventing water buildup while the vessel is in or out of the water.