This white nylon plastic scupper valve is made to stop water infiltration and drain the water out of a boat's inner hull. It is sturdy, durable, and great for boat transoms, fish wells, ice chests, and yachts. Its sealing ability lasts for a long time and it will not curl up or rot. The valve is easy to install and comes with a 4.7cm internal diameter and an 8.8cm external diameter. Features 1. Made of nylon plastic, sturdy and durable, long service life. 2. Used to stop water infiltration and to drain the water out of the inner hull of your boat. 3. Great accessories for boat transoms, fish wells, ice chests, yacht and more. 4. Will not curl up, rot, or lose their sealing ability. Specification Material: Nylon Plastic Color: White Size: Internal Diameter 4.7cm / 1.85in, External Diameter 8.8cm / 3.46in Weight: 62g Package Include: 1 Scupper Valve