The Piston,valve, cataloged under National Stock Number 4820-01-391-9231, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Automatic Switch Company Dba Asco. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-391-9231 |
| Primary Part Number | 40-143-14J |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Automatic Switch Company Dba Asco |
| Status | ACTIVE |
| Material | COPPER ALLOY |
| 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 |
|---|---|
| AV-46-646 PC 5 | Automatic Switch Company Dba Asco (USA) |
| 40-143-14J | Ives Equipment, Llc (USA) |
| 40-143-14J PRIMARY | Automatic Switch Company Dba Asco (USA) |
| Reference | Meaning |
|---|---|
| 40-143-14J | 5/9 Secondary reference U.S. Government activity |
| 3278385 PC 5 | 3/2 Design control — primary reference U.S. Government activity |
| GV40-143-14K | 5/1 Secondary reference Automatic Switch Company Dba Asco |
NSN 4820-01-391-9231 is a Piston,valve, manufactured by Automatic Switch Company Dba Asco, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-391-9231 has 3 manufacturer part numbers on file: AV-46-646 PC 5 (Automatic Switch Company Dba Asco), 40-143-14J (Ives Equipment, Llc), 40-143-14J (Automatic Switch Company Dba Asco).
Key specifications for 40-143-14J: Material: COPPER ALLOY. 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.