The Swing Check Valve is grooved end style. Grooved check valves may be installed in horizontal positions (or vertical with flow moving up).This valve is listed by Underwriters Laboratories of the US and Canada (UL/ULC) and FM Approved. It is drilled and tapped for ball drip application. Please refer to NIBCO® technical data sheets, chemical resistance guides and catalogs for engineering and installation information. These check valves are backed by the NIBCO® 5 years 125% limited warranty.