The 4" Double Check Detector N Pattern with OS&Y Valve System is a robust backflow prevention solution designed for fire protection and plumbing professionals seeking reliability and compliance in their water supply systems. Its rugged construction and thoughtful features make it ideal for commercial and residential environments requiring dependable flow control and contamination prevention.

• Material Durability: Constructed with fusion-bonded epoxy-coated ductile iron body (ASTM A536) and 300-series stainless steel internal components to resist corrosion and mechanical wear in demanding conditions.
• High-Strength Valve Components: Double check modules crafted from glass-filled Noryl™ thermoplastic ensure resilience under variable pressures and stresses.
• Replaceable Seals: EPDM elastomer seats are reversible and replaceable to maintain a leak-proof seal and simplify maintenance without shutting down the system.
• Regulatory Compliance: Certified UL 1469, FM Approved, ASSE 1015, and AWWA C510 compliant, supporting NFPA 13 and 25 standards through features like pre-drilled test cocks for mandatory differential pressure testing.
• Operational Flexibility: Capable of handling up to 175 PSI (12.1 bar) working pressure, with installation options in both horizontal and vertical orientations designed for upward flow.
• Connection Versatility: Available with ANSI B16.1 flanged and AWWA C606 grooved end connections, ensuring easy integration into various piping systems.
• OS&Y Valve Integration: Outside Stem and Yoke valve provides clear visual indication of valve status, simplifying system monitoring and maintenance checkpoints.
• Compact N Pattern Design: Optimized for tight spaces often found in mechanical rooms or underground vaults, ensuring installation flexibility without compromising performance.

This backflow preventer safeguards potable water supplies by efficiently blocking contaminated water from re-entering the clean water system, a critical function in fire protection setups and plumbing networks. The durable construction and compliance with stringent industry standards provide confidence for system operators managing safety-critical applications. Additionally, features like reversible seats and visual valve indicators reduce maintenance downtime and support ongoing regulatory inspections. Whether installed in commercial buildings or residential complexes, this assembly delivers reliable contamination prevention and operational transparency to meet the demands of modern water systems.