The Disk,valve, cataloged under National Stock Number 4820-01-237-6471, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is William Powell Company, the Dba Powell Valve Div the Starflo Corporation. Government technical data includes 8 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-237-6471 |
| Primary Part Number | E33419 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | William Powell Company, the Dba Powell Valve Div the Starflo Corporation |
| Status | ACTIVE |
| Pressure Rating | 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS |
| Shoulder Height | 0.047 INCHES NOMINAL IN |
| Style Designator | PLUG |
| Seat Angle | 15.0 DEGREES NOMINAL |
| Nominal Thread Size | 0.500 INCHES IN |
| Thread Class | 2A A |
| Material | STEEL CORROSION RESISTING |
| Thread Series Designator | UNEF |
| 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 |
|---|---|
| E33419 PRIMARY | William Powell Company, the Dba Powell Valve Div the Starflo Corporation (USA) |
| Reference | Meaning |
|---|---|
| SS845-1889567 | D/9 Drawing number reference only U.S. Government activity |
| 2620-925X2 | D/9 Drawing number reference only U.S. Government activity |
| 2620-925X2 PIECE18 1/2IN | 5/2 Secondary reference U.S. Government activity |
| SS845-1889567ASSYA PIECE18 1/2IN | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-237-6471 is a Disk,valve, manufactured by William Powell Company, the Dba Powell Valve Div the Starflo Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-237-6471 has 1 manufacturer part number on file: E33419 (William Powell Company, the Dba Powell Valve Div the Starflo Corporation).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-541-4658. Verify interchangeability with system specifications before substitution.
Key specifications for E33419: Overall Height: 0.625 INCHES NOMINAL IN; Pressure Rating: 150.0 POUNDS PER SQUARE INCH (PSI) NOMINAL LBS; Shoulder Height: 0.047 INCHES NOMINAL IN; Style Designator: PLUG. 8 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.