4" RP Assembly GXG OS&Y Backflow Preventor Valve for Fire Protection Systems Durable Ductile Iron ASTM A536 Certified

The 4" RP Assembly GXG OS&Y Backflow Preventor Valve is engineered to protect potable water supplies from contamination within commercial and residential fire protection systems. Installed inline on the main water supply feed, this reduced pressure principle assembly stops hazardous backflow using dual independently operating check valves and a differential pressure relief valve. Integrated OS&Y (Outside Screw and Yoke) gate valves allow you to easily isolate the system during maintenance or emergencies without requiring separate shut-off components.

This assembly complies with mandatory water safety and fire protection standards, satisfying UL 312, FM Approved, and ASSE 1013 requirements. It fulfills the installation mandates outlined in NFPA 13 for fire sprinkler system design and NFPA 25 for the periodic inspection, testing, and maintenance of water-based fire protection systems, ensuring your facility remains fully compliant with municipal code and life safety regulations.

• Ductile Iron Body: ASTM A536-compliant construction delivers high mechanical strength and corrosion resistance for harsh mechanical rooms.
• Precision Internals: Stainless steel springs and 300-series grade fasteners provide long-lasting operational reliability.
• Secure Sealing: EPDM rubber valve seats and seals offer chemical resistance while maintaining a positive seal against contamination.
• Grooved Connections: AWWA C606-compliant grooved ends enable faster installation with standard fire system piping.
• Flexible Layouts: Installs in horizontal or vertical setups with upward flow to accommodate tight mechanical room footprints.
• Operating Parameters: Supports maximum working pressures up to 175 PSI and operating temperatures ranging from 33°F to 140°F.

Contractors must verify local Authority Having Jurisdiction (AHJ) requirements and consult manufacturer technical cut sheets prior to pipe fitting and system pressurization.

Documentation: Download Manufacturer Technical Data & Cut Sheet (PDF)