The Parts Kit,safety Relief Valve, cataloged under National Stock Number 4820-01-473-4347, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Watts Regulator Company. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-473-4347 |
| Primary Part Number | RK909RV 1" 887131 |
| Item Name | Parts Kit,safety Relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| Component Quantity | 7 |
| End Item Source | 79227 |
| Supply Items and Quantities | 1 DIAPHRAGM;1DISC ASSEMBLY;1 SEAT O-RING;1 RV O-RING;2 PISTON O-RINGS;1 LUBRICANT |
| End Item Name | SERIES 909 1 INCH REDUCED PRESSURE ZONE BACKFLOW PREVENTER RELIEF VALVE IN |
| Accessory Controlling Agency | WATTS REGULATOR COMPANY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| RK909RV 1" 887131 PRIMARY | Watts Regulator Company (USA) |
| Reference | Meaning |
|---|---|
| RK909RV-887131 | C/1 Advisory reference — outside the item-of-supply concept Watts Regulator Company |
NSN 4820-01-473-4347 is a Parts Kit,safety Relief Valve, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-473-4347 has 1 manufacturer part number on file: RK909RV 1" 887131 (Watts Regulator Company).
Key specifications for RK909RV 1" 887131: Component Quantity: 7; End Item Source: 79227; Supply Items and Quantities: 1 DIAPHRAGM;1DISC ASSEMBLY;1 SEAT O-RING;1 RV O-RING;2 PISTON O-RINGS;1 LUBRICANT; End Item Name: SERIES 909 1 INCH REDUCED PRESSURE ZONE BACKFLOW PREVENTER RELIEF VALVE IN. 5 specifications are documented in the U.S. Government catalog.
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.