The Seat,valve, cataloged under National Stock Number 4820-01-555-1433, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Huntington Ingalls Inc Div Newport News Shipbuilding. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-555-1433 |
| Primary Part Number | 259127 PN 4 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Material Document and Classification | L-P-410, TYPE 6/6 FED SPEC SINGLE MATERIAL RESPONSE SEAT |
| Material | PLASTIC POLYAMIDE NYLON SEAT |
| 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 |
|---|---|
| 501-7638340 ITEM 12B | Naval Sea Systems Command (USA) |
| 259127 PN 4 PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 2680-2297 ITEM 12B | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
NSN 4820-01-555-1433 is a Seat,valve, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-555-1433 has 3 manufacturer part numbers on file: 501-7638340 ITEM 12B (Naval Sea Systems Command), 259127 PN 4 (Huntington Ingalls Inc Div Newport News Shipbuilding), 2680-2297 ITEM 12B (Huntington Ingalls Inc Div Newport News Shipbuilding).
Key specifications for 259127 PN 4: Material Document and Classification: L-P-410, TYPE 6/6 FED SPEC SINGLE MATERIAL RESPONSE SEAT; Special Features: SEAT REPLACEMENT FOR 10 INCH BULKHEAD VENTILATION VALVE ASSY - MOD FROM NAVSHIPS DWG 803-4444600 B; 501-7638340 AY96/AY98 IN; End Item Identification: S/A SSN4385D-SSN688CL 10 INCH BULKHEAD VENTILATION VALVE MODIFICATION (53711) 7638340 IN; Material: PLASTIC POLYAMIDE NYLON SEAT. 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.