The Valve,flow Control, cataloged under National Stock Number 4820-01-587-7143, 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 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-587-7143 |
| Primary Part Number | 555-6405456 AY87 |
| Item Name | Valve,flow Control |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| 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 |
|---|---|
| 555-6405456 AY87 PRIMARY | Naval Sea Systems Command (USA) |
| 211095739 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| DF2402-701 AY87 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| Reference | Meaning |
|---|---|
| 6405456 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-587-7143 is a Valve,flow Control, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-587-7143 has 3 manufacturer part numbers on file: 555-6405456 AY87 (Naval Sea Systems Command), 211095739 (Huntington Ingalls Inc Div Newport News Shipbuilding), DF2402-701 AY87 (Huntington Ingalls Inc Div Newport News Shipbuilding).
1 possible match (shared part number, not a government interchangeability claim): 4010-01-723-7192. Verify interchangeability with system specifications before substitution.
Key specifications for 555-6405456 AY87: End Item Identification: TEST FITTINGS FOR FMSW-25, 44 & 46 (MRC C4WX). 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.
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.