General: Outside Stem and Yoke or Outside Screw and Yoke ( OS&Y's)

How to Inventory:

• Inventory Required = Yes; if part of fire sprinkler system serving building.
• The primary backflow preventer that serves building water supply will be captured as infrastructure.
• OS&Y valves are typically located outside the building; however, they can be located inside.

How to establish Condition:

• Recommendation is to visually inspect for leaks, leaking packing or damage as well as age.
• Issue a corrective maintenance work order as necessary and have inspector inventory as part of Facilities Condition Assessment (FCA).

Applicable BSC and Assemblies:

• D40133101080UC: Backflow preventer, reduced pressure 4", sprinkler system, fire suppression (includes OS&Y valves)
• D40133101090UC: Backflow preventer, reduced pressure 6", sprinkler system, fire suppression (includes OS&Y valves)
• D40133101095UC: Backflow preventer, reduced pressure 8", sprinkler system, OS&Y

Use of Cost Adders:

• Rigging, flanges, spools, obsolete equipment replacement