Description
The Watts 957-OSY-FS 10" Reduced Pressure Zone Assembly is a stainless-steel backflow preventer engineered to protect potable water supplies from contamination caused by backpressure or backsiphonage. Its compact, lightweight design, flood-sensor readiness, and durable construction make it ideal for health-hazard cross-connections, service-line protection, and facility-wide potable water systems.
Features
- 304 stainless steel housing and sleeve for corrosion resistance and durability.
- Torsion-spring dual-check modules for reliable, low-pressure-loss protection against backflow.
- Bottom-mounted cast stainless steel relief valve for maintenance-friendly service.
- Resilient seated outside-stem-and-yoke (OSY) gate shutoff valves on inlet and outlet.
- Grooved-joint inlet and outlet connections for easier pipe alignment and installation in tight spaces.
- Compact design — significantly lighter than traditional backflow preventers — simplifies installation and servicing.
- Option for flood detection via built-in port, compatible with building management system (BMS) or cellular alert kits.
Specs
Series: 957-OSY-FS 10"
Body Material: 304 Stainless Steel (Schedule 40)
Backflow Preventer Type: Reduced Pressure Zone Assembly (RPZ)
Max Working Pressure: 175 PSI
Temperature Range: 33 °F − 140 °F
Inlet / Outlet Size: 10" grooved joint
Shutoff Valves: Outside-Stem-and-Yoke (OSY) gate valves
Internal Protection: Dual torsion-spring checks + differential relief valve
Relief Valve: Bottom-mounted stainless steel
Elastomers: EPDM / Silicone (replaceable check discs)
Body Material: 304 Stainless Steel (Schedule 40)
Backflow Preventer Type: Reduced Pressure Zone Assembly (RPZ)
Max Working Pressure: 175 PSI
Temperature Range: 33 °F − 140 °F
Inlet / Outlet Size: 10" grooved joint
Shutoff Valves: Outside-Stem-and-Yoke (OSY) gate valves
Internal Protection: Dual torsion-spring checks + differential relief valve
Relief Valve: Bottom-mounted stainless steel
Elastomers: EPDM / Silicone (replaceable check discs)
