Viking has introduced UL-listed and FM-approved 1 1/2" and 2" check valves. For use in dorm work, multi-family housing, small preaction systems and floor control assemblies, Viking's new smaller check valves are designed for quick and easy installation vertically or horizontally. These check valves are rated up to 250 psi water working pressure and include a tapped opening for easy system draining. Both the 1 1/2" and 2" valves are UL and ULC listed in threaded or grooved styles and are FM approved in the grooved configuration as both single check valves and anti-water hammer check valves. Viking Corp.