The Retainer,disk,valve, cataloged under National Stock Number 4820-01-418-1719, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-418-1719 |
| Primary Part Number | 218015925 |
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Outside Diameter | 1.000 INCHES NOMINAL IN |
| Inside Diameter | 0.323 INCHES NOMINAL IN |
| Material | STEEL CORROSION RESISTING |
| 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 |
|---|---|
| 218015925 PRIMARY | Naval Sea Systems Command (USA) |
| 556-6406378-MPBR-B14 | Naval Sea Systems Command (USA) |
| 556-6406378-MPBR-A14 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| C791-5401 FIND MPBR-A14 | 5/9 Secondary reference U.S. Government activity |
| DF2300-4640 FIND MPBR-A14 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-418-1719 is a Retainer,disk,valve, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-418-1719 has 3 manufacturer part numbers on file: 218015925 (Naval Sea Systems Command), 556-6406378-MPBR-B14 (Naval Sea Systems Command), 556-6406378-MPBR-A14 (Naval Sea Systems Command).
Key specifications for 218015925: Outside Diameter: 1.000 INCHES NOMINAL IN; Inside Diameter: 0.323 INCHES NOMINAL IN; End Item Identification: SEAWOLF CLASS SSN; Material: STEEL CORROSION RESISTING. 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.
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.