3" Reduced Pressure Assembly Without OSY For Fire Safety

The Zurn Wilkins 3" Reduced Pressure Assembly Without OS&Y is engineered for fire protection and suppression systems to provide critical backflow prevention, safeguarding potable water supplies from contamination during emergency operations. By utilizing reduced pressure technology, this assembly maintains a differential pressure zone between two independently operating check valves, venting potential backflow to the atmosphere and satisfying strict cross-connection control mandates.

Designed to comply with essential municipal and life safety fire protection regulations, this device ensures commercial and institutional installations pass AHJ inspections while maintaining uninterrupted flow capacity for emergency suppression demands in compliance with standards such as NFPA 13 and NFPA 25.

• Reduced Pressure Technology: Prevents backflow contamination to preserve municipal water quality during fire suppression events.
• 3-Inch Connection Size: Balances high-volume flow capacity with the space-saving demands of mid-sized commercial setups.
• OS&Y Valve Omission: Eliminates the outside stem and yoke valve to minimize potential leak points, lower system costs, and simplify mechanical room integration.
• Compact Footprint: Facilitates straightforward installation in tight or complex plumbing and mechanical spaces.
• Durable Construction: Built to withstand sustained pressure fluctuations and demanding environmental conditions in commercial facilities.

Contractors and facility managers must verify local Authority Having Jurisdiction (AHJ) requirements and consult the manufacturer technical data sheets prior to job site installation.

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