The NIBCO® cast iron butterfly valve provides ease of operation with quarter-turn (90 degrees) open to close. The EPDM cartridge seat liner with aluminum bronze 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 economical applications inmore commercial systems. These valves are backed by the NIBCO 5-year125% limited warranty. less