Features： 1、Draining Plug: Garboard drainer with removable plug can easily drain the bottom tank when the ship is ashore. 2、Secure Sealing: Tapered pipe thread with rubber O ring ensures tight and secure sealing under high vibration. 3、Good Material: Adopting 316 stainless steel, which is not easy to rust with high hardness and high strength. 4、Great Crafting: Mirror polished surface is smooth without burrs, does not hurt your hand and also very durable. 5、Easy to Install: Small size, light weight and deep thread enable easy installation to be finished in minutes. Specification： Item Type: Garboard Drain Plug Material: 316 Stainless Steel Function: The ship board drainer with detachable stopper can drain the bottom tank when the ship is towed out of the water. Drain Size: 25mm (1in) Outer Ring Diameter: Approx. 50mm / 1.97in Positioning Hole Diameter: Approx. Φ4mm / 0.16in Package List： 1 x Garboard Drain Plug