The Seat,valve, cataloged under National Stock Number 4820-01-020-9969, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Wilo Usa Llc. Government technical data includes 6 specifications, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-020-9969 |
| Primary Part Number | 17-000-575 |
| Item Name | Seat,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Wilo Usa Llc |
| Status | ACTIVE |
| Body Outside Diameter | 5.373 INCHES MINIMUM AND 5.377 INCHES MAXIMUM IN |
| Style Designator | PLAIN |
| Body Inside Diameter | 4.125 INCHES NOMINAL IN |
| Material | PLASTIC POLYTETRAFLUOROETHYLENE OVERALL |
| Seat Angle in Deg | 45.000 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 |
| Part Number | Manufacturer |
|---|---|
| 17-000-575 PRIMARY | Wilo Usa Llc (USA) |
| Reference | Meaning |
|---|---|
| 133-000-072 | C/1 Advisory reference — outside the item-of-supply concept Wilo Usa Llc |
| 133-000-072 | 5/9 Secondary reference Perkins Engines Inc |
NSN 4820-01-020-9969 is a Seat,valve, manufactured by Wilo Usa Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-020-9969 has 1 manufacturer part number on file: 17-000-575 (Wilo Usa Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-123-3850. Verify interchangeability with system specifications before substitution.
Key specifications for 17-000-575: Overall Height: 0.804 INCHES MINIMUM AND 0.820 INCHES MAXIMUM IN; Body Outside Diameter: 5.373 INCHES MINIMUM AND 5.377 INCHES MAXIMUM IN; Style Designator: PLAIN; Body Inside Diameter: 4.125 INCHES NOMINAL IN. 6 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.