The Valve Assembly,manifold, cataloged under National Stock Number 4820-01-233-5578, 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. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-233-5578 |
| Primary Part Number | 258631 ASSEMBLY A |
| Item Name | Valve Assembly,manifold |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Huntington Ingalls Inc Div Newport News Shipbuilding |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 258631 ASSEMBLY A PRIMARY | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 5588156 ASSY A | Trident Maritime Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 5588156 ASSY A | 5/9 Secondary reference Mindeco Corp |
| 5588156 ASSEMBLY A | 3/2 Design control — primary reference U.S. Government activity |
NSN 4820-01-233-5578 is a Valve Assembly,manifold, manufactured by Huntington Ingalls Inc Div Newport News Shipbuilding, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-233-5578 has 2 manufacturer part numbers on file: 258631 ASSEMBLY A (Huntington Ingalls Inc Div Newport News Shipbuilding), 5588156 ASSY A (Trident Maritime Systems, Inc.).
Key specifications for 258631 ASSEMBLY A: End Item Identification: 8VL MANIFOLD. 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 4820-01-233-5578 has DEMIL Code B. 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.