The item shown in the image is a brass marine deck scupper plug (specifically sized for 65mm–85mm drain openings), designed with an expandable rubber seal and a T-bar/wing screw tightening mechanism. It is commonly used on ships and boats to block deck drainage holes and prevent water ingress or contain spills.Material: Heavy-duty brass casting with an oil-resistant rubber (NBR/neoprene) expansion sleeve.Size range: 65mm – 85mm (stamped on the top brass plate).Operation: Insert into the scupper pipe and turn the top handle clockwise to expand the rubber base, creating a watertight, leak-proof seal.If you'd like, I can help you find local marine equipment suppliers or provide instructions on how to properly install and maintain this scupper plug.