The 6" Fig 20Gx Double Check OSY Backflow Prevention Assembly is designed for fire protection professionals who require a reliable solution to prevent backflow and maintain potable water safety. Built for durability in demanding environments, this assembly ensures compliance with critical industry standards while simplifying system maintenance and inspection.

• Durable Construction: Made from fusion-bonded epoxy-coated ductile iron (ASTM A536), providing superior corrosion resistance in subterranean or mechanical room installations.
• Premium Internal Components: Incorporates 300-series stainless steel springs and fasteners to withstand cyclic pressure without compromising structural integrity.
• Advanced Seal Technology: Features check modules crafted from glass-filled Noryl™ thermoplastic for a low friction, long-lasting seal, combined with reversible, replaceable EPDM elastomer discs to reliably block contamination.
• OS&Y Valve Design: Outside Stem & Yoke valve allows visible valve position indication and easy operation without dismantling the assembly, improving maintenance efficiency and reducing downtime.
• Regulatory Compliance: UL Listed under UL 1469, FM Approved, ASSE 1015 certified, complies with AWWA C510 design standards, and supports NFPA 13 and NFPA 25 inspection protocols, ensuring it meets stringent fire protection and potable water safety codes.
• Versatile Installation: Compatible with ANSI B16.1 flanged ends and AWWA C606 grooved ends, suitable for horizontal and vertical (upward flow) installations.
• Operational Metrics: Rated for a maximum operating pressure of 175 PSI and temperature range from 33°F to 140°F, matching typical fire sprinkler water supply requirements.

This backflow preventer safeguards fire protection systems by effectively blocking reverse water flow, which could otherwise cause contamination of potable water supplies. Its corrosion-resistant materials and OS&Y valve design promote long service life and easier inspection, reducing maintenance costs and system downtime. Ideal for engineers, plumbers, and fire safety professionals, the assembly ensures adherence to compliance mandates while providing reliable operation under demanding conditions. Compared to alternatives lacking outside stem and yoke valves or constructed with less durable materials, this assembly delivers enhanced operational transparency and reduces risk of functional failure, supporting safer, code-compliant fire protection system maintenance.