The Valve,vent, cataloged under National Stock Number 4820-01-555-3375, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 4820-01-555-3375 |
| Primary Part Number | 501-7638340 AY97 |
| Item Name | Valve,vent |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL D — Destroy Item |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 501-7638340 AY97 PRIMARY | Naval Sea Systems Command (USA) |
| 2680-2297 AY97 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 501-7638340 AY97 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-555-3375 is a Valve,vent, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-555-3375 has 2 manufacturer part numbers on file: 501-7638340 AY97 (Naval Sea Systems Command), 2680-2297 AY97 (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 501-7638340 AY97: Special Features: ITEM NAME TEXT AND INAVY NAME ARE VALVE, VENT MODIFIED; End Item Identification: VALVE,VENT MODIFIED 501-7638340 AY97. 0 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.
NSN 4820-01-555-3375 has DEMIL Code D. Demilitarization may be required before disposal or transfer to non-military entities.
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.