The Parts Kit,safety Relief Valve, cataloged under National Stock Number 4820-01-408-4757, 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 2 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-408-4757 |
| Primary Part Number | RK909SV-887371 |
| Item Name | Parts Kit,safety Relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Watts Regulator Company |
| Status | ACTIVE |
| End Item Source | 79227 |
| End Item Name | BACKFLOW PREVENTER |
| 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 |
|---|---|
| RK909SV-887371 PRIMARY | Watts Regulator Company (USA) |
| 887371 | Watts Regulator Company (USA) |
NSN 4820-01-408-4757 is a Parts Kit,safety Relief Valve, manufactured by Watts Regulator Company, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-408-4757 has 2 manufacturer part numbers on file: RK909SV-887371 (Watts Regulator Company), 887371 (Watts Regulator Company).
1 possible match (shared part number, not a government interchangeability claim): 5310-01-466-4651. Verify interchangeability with system specifications before substitution.
Key specifications for RK909SV-887371: End Item Source: 79227; End Item Name: BACKFLOW PREVENTER; End Item Identification: SERIES 909,SIZE 1 1/4 TO 2 IN. IN. 2 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.