The Vent Drain Fitting Assy, cataloged under National Stock Number 4820-01-511-9855, 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 1 specification, cited from the U.S. Government catalog. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-511-9855 |
| Primary Part Number | 801-6758500 ASSY 46 |
| Item Name | Vent Drain Fitting Assy |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Material | STEEL CORROSION RESISTING |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 801-6758500 ASSY 46 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6758500 | D/9 Drawing number reference only Naval Sea Systems Command |
| 2633-827-01 ASSY 46 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-511-9855 is a Vent Drain Fitting Assy, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-511-9855 has 1 manufacturer part number on file: 801-6758500 ASSY 46 (Naval Sea Systems Command).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-522-8141. Verify interchangeability with system specifications before substitution.
Key specifications for 801-6758500 ASSY 46: Overall Length: 4.300 INCHES NOMINAL IN; Part Name Assigned by Controlling Agency: VENT AND DRAIN FITTING ASSYS; Material: STEEL CORROSION RESISTING. 1 specification is 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 4820-01-511-9855 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.