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 and 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 Percent limited warranty.