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 NOT 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 years 125% limited warranty.