The NIBCO ductile iron butterfly control valve is designed specifically to meet the rigorous requirements of higher pressure automatic sprinkler systems. The EPDM seat disc provides bubble-tight shutoff at rated pressure. With the internal splined stem/disc drive design 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 installation information. Choose NIBCO butterfly valves for the most specified, versatile and economical valve option in commercial, mechanical and fire protection systems. NIBCO butterfly valves are backed by the NIBCO 5-year 125 Percent limited warranty.