The Valve Assembly, cataloged under National Stock Number 4820-01-388-1165, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-388-1165 |
| Primary Part Number | 512-6404649 ASSEMBLY 99L1 |
| Item Name | Valve Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Valve Quantity | 4 |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS |
| 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 |
|---|---|
| 512-6404649 ASSEMBLY 99L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 211043604L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 211043604 | 3/1 Design control — primary reference Naval Sea Systems Command |
| DN6503-170D4 | 5/1 Secondary reference U.S. Government activity |
| 51221173 | 5/1 Secondary reference U.S. Government activity |
| 512-6404649 ASSEMBLY 99 | 5/1 Secondary reference Naval Sea Systems Command |
| 51221173L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| DN6503-170D4L1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-388-1165 is a Valve Assembly, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-388-1165 has 2 manufacturer part numbers on file: 512-6404649 ASSEMBLY 99L1 (Naval Inventory Control Point Mechanicsburg), 211043604L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 512-6404649 ASSEMBLY 99L1: Valve Quantity: 4; Criticality Code Justification: ZZZY; End Item Identification: SEAWOLF CLASS SUBMARINE AIR INDUCTION AND DIESEL EXHAUST ASSY; Reference Number Differentiating Characteristics: QUALITY CONTROL IAW NAVSHIPS 0948-045-7010 MATERIAL IDENTIFICATION AND CONTROL INSTRUCTION FOR LEVEL 1 ITEMS. 3 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 4820-01-388-1165 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.