The Valve,vent, cataloged under National Stock Number 4820-01-039-9781, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Wisconsin Motors, Llc. Government technical data includes 10 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-039-9781 |
| Primary Part Number | L0-201 |
| Item Name | Valve,vent |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Wisconsin Motors, Llc |
| Status | ACTIVE |
| Connection Style | BEADED (HOSE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST END |
| Nominal Inside Diameter Hose Accommodated | 0.500 INCHES FIRST END IN |
| Connection Type | UNTHREADED EXTERNAL HOSE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU NOTE: TO BE USED FOR VALVE BODIES OF ONE SECTION ONLY. |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Material | STEEL OVERALL |
| Thread Series Designator | NPTF FIRST END |
| 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 |
|---|---|
| L0-201 PRIMARY | Wisconsin Motors, Llc (USA) |
| Reference | Meaning |
|---|---|
| 117A94 | 5/9 Secondary reference United Air Filter, Inc. |
NSN 4820-01-039-9781 is a Valve,vent, manufactured by Wisconsin Motors, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-039-9781 has 1 manufacturer part number on file: L0-201 (Wisconsin Motors, Llc).
1 possible match (shared part number, not a government interchangeability claim): 5999-01-380-6119. Verify interchangeability with system specifications before substitution.
Key specifications for L0-201: Connection Style: BEADED (HOSE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END; Nominal Inside Diameter Hose Accommodated: 0.500 INCHES FIRST END IN; Connection Type: UNTHREADED EXTERNAL HOSE SECOND END. 10 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.