The NIBCO® wafer type butterfly valve is provided with undercut discs for actuation purposes only. The valve is specifically designed for low pressure (100 PSI bubble-tight) on/off or modulating applications to be used in conjunction with pneumatic or electric actuators. The NIBCO® ductile iron butterfly valve features a unique molded-in Buna-N seat liner with ductile iron, electro nickel plated disc, recommended for most water applications. The internal stem/disc geometric drive designmore eliminates the 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. less