The NIBCO® ductile iron butterfly valve features a unique molded-in EPDM seat liner with ductile iron, electro nickel plated disc, recommended for most water applications. With the internal stem/disc geometric drive design eliminates there is no need for pins or bolts that may create leak paths or turbulence in the waterway. 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 installationmore 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. less