This Seachoice Twist Type Drain Plug is a high-quality product that fits tubes with a diameter of 1 inch. It is made of brass and comes with a neoprene seal to ensure a secure and leak-free plugging. The plug is compatible with various types of boats and is easy to install.The manufacturer part number for this product is 18801. It is suitable for use in draining water from boats and other vessels. The plug is designed to fit snugly and securely, preventing any leaks or drips. This product is a must-have for any boat owner who wants to keep their vessel dry and comfortable.