The NIBCO® ductile iron butterfly valve provides ease of operation with quarter-turn (90 degrees) open to close. The unique EPDM molded-in seat liner with Nylon Coated Ductile Iron disc is recommended for the higher pressure requirements of Commercial HVAC systems today. 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 valve option in commercial, mechanical and industrial applications. NIBCO® butterfly valves are backed by the NIBCO 5-year 125% limited warranty.