The NIBCO® cast iron butterfly valve provides ease of operation with quarter-turn (90 degrees) open to close. The Buna-N cartridge seat liner with ductile iron, electro nickel plated disc has good abrasion resistance properties and compatibility with solvents, oil, water and hydraulic fluid for compressed air. 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.more Choose NIBCO® international cast iron butterfly valves for versatile and economical applications in commercial systems. These valves are backed by the NIBCO 5-year125% limited warranty less