The Valve,plug, cataloged under National Stock Number 4820-01-409-0043, 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 2 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-409-0043 |
| Primary Part Number | 6537775 ITEM 36 |
| Item Name | Valve,plug |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Valve Operation Method | MANUAL |
| 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 |
|---|---|
| 6537775 ITEM 36 | Naval Sea Systems Command (USA) |
| 400-6537775 REV ITEM 36 | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 400-6537775 | D/9 Drawing number reference only Naval Sea Systems Command |
| M8830056 | 3/9 Design control — primary reference Naval Ship Engineering Center Philadelphia Division Submarine Antenna Quality Assurance |
NSN 4820-01-409-0043 is a Valve,plug, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-409-0043 has 2 manufacturer part numbers on file: 6537775 ITEM 36 (Naval Sea Systems Command), 400-6537775 REV ITEM 36 (Naval Sea Systems Command).
Key specifications for 6537775 ITEM 36: Special Features: USED ON SSN 688 CLASS SUBMARINE NO.1 PERISCOPE SYSTEM; Media for Which Designed: FUEL/OIL, HYDROCARBON SINGLE RESPONSE; Valve Operation Method: MANUAL. 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.