The NIBCO® cast iron gate valve provides full flow with minimal pressure drop. The NIBCO® flanged cast iron gate valve is designed to be the main control valve in an automatic fire sprinkler system. The cast iron gate valve features a Class 125 flanged, flat face end connection 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. It is listed by Underwriters Laboratories of the US and Canada (UL/ULC) and FM Approved.