The Valve,air Pressure, cataloged under National Stock Number 4820-00-438-0633, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Leonardo Spa Helicopters Division - Production Site. 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 3 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-438-0633 |
| Primary Part Number | 204-070-483-3 |
| Item Name | Valve,air Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Leonardo Spa Helicopters Division - Production Site |
| Status | ACTIVE |
| General Characteristics Item Description | 3.000 IN. LG,3.000 W,2.190 IN. H W |
| 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 |
|---|---|
| 204-070-483-3 | Leonardo Spa Helicopters Division - Production Site (ITA) |
| Reference | Meaning |
|---|---|
| 204-070-483-003 | 5/2 Secondary reference U.S. Government activity |
| 204-070-483-3 | 7/2 Vendor item drawing reference U.S. Government activity |
| 4820PL1938766 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
| 7220-3 | 3/9 Design control — primary reference U.S. Government activity |
NSN 4820-00-438-0633 is a Valve,air Pressure, manufactured by Leonardo Spa Helicopters Division - Production Site, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-438-0633 has 1 manufacturer part number on file: 204-070-483-3 (Leonardo Spa Helicopters Division - Production Site).
3 possible matches (shared part number, not a government interchangeability claim): 5950-00-539-3109, 5305-01-393-1906, 5950-01-606-0284. Verify interchangeability with system specifications before substitution.
Key specifications for 204-070-483-3: General Characteristics Item Description: 3.000 IN. LG,3.000 W,2.190 IN. H W. 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.
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.