Kayak Drain Plug Kit Thread Bung for Kayak Canoe Boat Set of 2 and 4 Screws Outside diameter of scupper plug: Approx 25mm / 1 inch Widely used: it is suitable for all kinds of canoeing, canoe, ship drain plug Function: Stops water infiltration and is used to drain the water out of the inner hull of your boat Easy to install: Simple drill holes and hard to mess up. High quality: Kayak Drain Plugs Kit is made of high quality plastic, durable and not easy to bad. Rubber gasket on each plug protect hull from damage