The Valve,check, cataloged under National Stock Number 4820-01-537-0187, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 3 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-537-0187 |
| Primary Part Number | 139-6873 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Flow Control Device | BALL |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 139-6873 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 10322275 | 6/9 Informative reference only Nimikkeistokeskus Ncb Finland |
| 12KP738 | 5/9 Secondary reference Oshkosh Corp |
| 12KP738 | 5/9 Secondary reference Oshkosh Defense Llc |
NSN 4820-01-537-0187 is a Valve,check, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-537-0187 has 1 manufacturer part number on file: 139-6873 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 139-6873: Flow Control Device: BALL; Media for Which Designed: FUEL/OIL, HYDROCARBON SINGLE RESPONSE; Part Name Assigned by Controlling Agency: FUEL BYPASS VALVE; End Item Identification: HEMP ENDURABLE POWER SYSTEM. 3 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.