The Valve,relief,pressure and Temper, cataloged under National Stock Number 4820-01-258-9309, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is W B Arnold Company, Inc.. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | W B Arnold Company, Inc. (CAGE 2H266) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-258-9309 |
| Primary Part Number | 178390 |
| Item Name | Valve,relief,pressure and Temper |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | W B Arnold Company, 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 |
|---|---|
| 65520306 AND 33414129 | W B Arnold Company, Inc. (USA) |
| 178390 PRIMARY | W B Arnold Company, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 178390 | 5/9 Secondary reference Wartsila Water Systems Limited |
| 65520306 AND 33414129 | 5/9 Secondary reference Wartsila Water Systems Limited |
| 450041-8 | 5/9 Secondary reference W B Arnold Company, Inc. |
| D-5366 ITEM 265 | 5/9 Secondary reference W B Arnold Company, Inc. |
| D-5366 ITEM 265 | 5/9 Secondary reference Wartsila Water Systems Limited |
NSN 4820-01-258-9309 is a Valve,relief,pressure and Temper, manufactured by W B Arnold Company, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-258-9309 has 2 manufacturer part numbers on file: 65520306 AND 33414129 (W B Arnold Company, Inc.), 178390 (W B Arnold Company, Inc.).
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.