The resilient wedge, ductile iron gate valve features Class 125 flanged, flat face end connections for easy installation and accessibility. Outside screw and yoke (OS&Y) gate valves are recommended when positive shutoff and a quick visual indicator of open/closed position is required. This valve features a pre-grooved stem for tamper switch mounting and is drilled, tapped, and plugged at location "A" for bypass. It is listed by Underwriters Laboratories of the US and Canada (UL/ULC) and FM Approved. Please refer to NIBCO technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Choose NIBCO® gate valves for the most specified, versatile and economical valve option in commercial, mechanical, fire protection and industrial applications. NIBCO® pressure rated valves are backed by the NIBCO 5-year 125% limited warranty.