The Parts Kit,safety Relief Valve, cataloged under National Stock Number 4820-01-225-2857, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Atlas Metal Industries Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Parts Kit,safety Relief Valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Atlas Metal Industries Inc (CAGE 32061) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-225-2857 |
| Primary Part Number | 3948 |
| Item Name | Parts Kit,safety Relief Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Atlas Metal Industries Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 3948 PRIMARY | Atlas Metal Industries Inc (USA) |
| Reference | Meaning |
|---|---|
| 3948 | 3/9 Design control — primary reference Precision Metal Products Inc |
NSN 4820-01-225-2857 is a Parts Kit,safety Relief Valve, manufactured by Atlas Metal Industries Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-225-2857 has 1 manufacturer part number on file: 3948 (Atlas Metal Industries Inc).
2 possible matches (shared part number, not a government interchangeability claim): 5310-01-423-2323, 5340-01-608-6555. Verify interchangeability with system specifications before substitution.
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.