This drain plug water infiltration and is used to drain the water out of the inner hull of your boat, which featuring an o-ring for positive sealing. and O-ring maintain sealing under high vibration conditions. Retention system keeps plug from getting lost when removed. Feature - Color: Black. - Material: Plastic. - Size: 4.2x4.2x3cm - Made of material, durable and , and the rubber gasket on each plug protect hull from damage. - Universal drain plug kit to add or replace old drain plugs. - Easy to install on or remove from the kayak. - maintain sealing under high vibration conditions. - Retention system stops plug from getting lost when removed. - It stops water infiltration and is used to drain the water out of the inner hull of your boat. - Warm Tip: Dear buyer, Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand! Thank you! Package list: 2 x drain plugs