The Valve,check, cataloged under National Stock Number 4820-01-533-6178, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is The Specialty Mfg. Co Dba Specialty Mfg. Co. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-533-6178 |
| Primary Part Number | 6450090 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | The Specialty Mfg. Co Dba Specialty Mfg. Co |
| Status | ACTIVE |
| Material | COPPER ALLOY BODY |
| 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 |
|---|---|
| 810-8F8M-B | The Specialty Mfg. Co Dba Specialty Mfg. Co (USA) |
| 6450090 PRIMARY | The Specialty Mfg. Co Dba Specialty Mfg. Co (USA) |
| Reference | Meaning |
|---|---|
| 810-8F8M | 5/1 Secondary reference The Specialty Mfg. Co Dba Specialty Mfg. Co |
| 3001270-005 | 5/2 Secondary reference U.S. Government activity |
| 3001270-005 | 5/9 Secondary reference Hdt Tactical Power, Inc. |
NSN 4820-01-533-6178 is a Valve,check, manufactured by The Specialty Mfg. Co Dba Specialty Mfg. Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-533-6178 has 2 manufacturer part numbers on file: 810-8F8M-B (The Specialty Mfg. Co Dba Specialty Mfg. Co), 6450090 (The Specialty Mfg. Co Dba Specialty Mfg. Co).
Key specifications for 6450090: Special Features: BUNA SEAL; Part Name Assigned by Controlling Agency: VALVE CHECK 1/2" NPT F-M; End Item Identification: PU-820/T, GENERATOR SET, DIESEL ENGINE; Material: COPPER ALLOY BODY. 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.