The Seat,valve, cataloged under National Stock Number 4820-00-445-4422, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 7 specifications, cited from the U.S. Government catalog. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-00-445-4422 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Body Outside Diameter | 0.429 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Material Document and Classification | MIL-M-20693 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL |
| Body Inside Diameter | 0.257 INCHES MINIMUM AND 0.258 INCHES MAXIMUM IN |
| Material | FABRIC, NYLON OVERALL |
| Seat Angle in Deg | 90.000 NOMINAL |
| Seating Surface Shape | ANGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 183228-81 | 5/9 Secondary reference U.S. Government activity |
| 183228-0081 | 3/2 Design control — primary reference U.S. Government activity |
| 280566PC16 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-00-445-4422 is a Seat,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-147-3729, 4820-01-370-6502. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-00-445-4422: Overall Height: 0.048 INCHES MINIMUM AND 0.050 INCHES MAXIMUM IN; Body Outside Diameter: 0.429 INCHES MINIMUM AND 0.430 INCHES MAXIMUM IN; Style Designator: PLAIN; Material Document and Classification: MIL-M-20693 MIL SPEC SINGLE MATERIAL RESPONSE OVERALL. 7 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.