The Valve,check, cataloged under National Stock Number 4820-01-384-9019, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Diamond Power International, Inc.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Valve,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Diamond Power International, Inc. (CAGE 17590) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-384-9019 |
| Primary Part Number | 3121751857 ITEM 7 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Diamond Power International, Inc. |
| Status | ACTIVE |
| 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 |
|---|---|
| 301571-4029 | Diamond Power International, Inc. (USA) |
| 3121751857 ITEM 7 PRIMARY | Diamond Power International, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 3121751857 | D/9 Drawing number reference only Diamond Power International, Inc. |
NSN 4820-01-384-9019 is a Valve,check, manufactured by Diamond Power International, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-384-9019 has 2 manufacturer part numbers on file: 301571-4029 (Diamond Power International, Inc.), 3121751857 ITEM 7 (Diamond Power International, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4730-01-385-1263, 2090-01-385-8540. Verify interchangeability with system specifications before substitution.
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.