Features Good material: use of 316 stainless steel, which is not easy to rust with high hardness and high strength. DRAIN PLUG Garboard drainer with removable plug can easily empty the bottom tank when the ship is ashore. GREAT WORKMANSHIP The mirror polished surface is smooth without burrs, won't hurt your hand and also very durable. SECURE SEALING Tapered pipe thread with rubber O-ring ensures tight and secure seal at high vibrations. EASY TO INSTALL Small size, light weight and deep thread allow for easy installation in minutes. Specification: Item Type:Garboard Drain Plug Material: 316 stainless steel. Function The board drain with removable plug can empty the bottom tank when the ship is towed out of the water. Drain size 1" (25mm) Outer ring diameter: approx. 50 mm. Positioning Hole Diameter: Approx. Φ4mm/0.16inch Package list: 1 x Garboard drain plug. Small note: Please perform regular maintenance and inspection for rust when working at sea. Package List 1 x Garboard Drain Plug