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FM UL Fire Protection System Fire Sprinkler System Flanged Osy Gate Valve. FM & UL Certified: Certified for fire sprinkler systems ensuring highest safety standards. OS&Y Design: Outside Screw & Yoke provides clear visual open/closed status indication. Ductile Iron Body: Robust ASTM A536 ductile iron construction for durability. Customizable Coating: Fusion bonded epoxy or painting available upon customer requirements. Wide Size Range: Available in sizes from 2 inches to 72 inches. Multiple Connections: Supports Flange (BS, EN, AWWA) and Grooved End connections. 28 Years Experience: Over two decades of focus in fire protection field solutions. Global Service: Serving clients in over 60 countries with reliable after-sales support.