1、Twisting Rotation: Mounts in a 1 in/25mm diameter hole in hull,Twist turn, Fully adjustable will not leakage or jar loose under vibration. 2、Maintain Sealing: Threads and o circle ensure a water tight fit,maintain sealing under vibration conditions.It is a useful tool for draining water 3、Stainless Steel Material: Marine drain plug is made of stainless steel material,maximum corrosion resistance and durability. Can be used for a long time 4、Scope of Application: The drainage plug ship has fine workmanship and simple operation, and is suitable for stern, fish well, freezer, etc. 5、Prevent Loss: Screw type drain plug with a o circle washer for positive sealing,Retention system prevents plug from getting lost when removed.