The Retainer,fuel Check Valve, cataloged under National Stock Number 4820-00-531-4258, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Rtx Corporation Div Pratt & Whitney. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-00-531-4258 |
| Primary Part Number | 404919 |
| Item Name | Retainer,fuel Check Valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Rtx Corporation Div Pratt & Whitney |
| Status | ACTIVE |
| General Characteristics Item Description | 2 MTG HOLES,MOUNTS ON HOUSING ASSY P/N 404918 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | F |
| Part Number | Manufacturer |
|---|---|
| 404919 | Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney (USA) |
| 404919 PRIMARY | Rtx Corporation Div Pratt & Whitney (USA) |
| Reference | Meaning |
|---|---|
| 404919 | 3/9 Design control — primary reference Turbo Power & Marine System Inc Sub of United Technologies Corp |
NSN 4820-00-531-4258 is a Retainer,fuel Check Valve, manufactured by Rtx Corporation Div Pratt & Whitney, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-531-4258 has 2 manufacturer part numbers on file: 404919 (Rtx Corporation Dba Pratt & Whitney Div Pratt &whitney), 404919 (Rtx Corporation Div Pratt & Whitney).
Key specifications for 404919: General Characteristics Item Description: 2 MTG HOLES,MOUNTS ON HOUSING ASSY P/N 404918; End Item Identification: VALVE ASSY P/N 406376. 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.