NIBCO® ductile iron butterfly valves provide ease of operation with quarter-turn (90 degrees) open to close. The EPDM cartridge 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® butterfly valves for the most specified, versatile and economical valvemore option in commercial, mechanical and industrial applications. NIBCO® butterfly valves are backed by the NIBCO 5-year 125% limited warranty. less