The NIBCO® cast iron butterfly valve provides ease of operation with quarter-turn (90 degrees) open to close. The EPDM cartridge seat liner with ductile iron, electro nickel plated disc is recommended for most water applications. An extended neck allows for insulation up to 2 inches. Please refer to NIBCO technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Choose NIBCO® international cast iron butterfly valves for versatile and economicalmore applications in commercial systems. These valves are backed by the NIBCO 5-year125% limited warranty. less