The Indicator,valve Opening, cataloged under National Stock Number 4820-01-391-6445, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-391-6445 |
| Item Name | Indicator,valve Opening |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Material | NICKEL ALLOY CASE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 22400 4IN. FIND 27 | 5/9 Secondary reference U.S. Government activity |
| X101 76186G | 5/9 Secondary reference U.S. Government activity |
| 76186G | 3/2 Design control — primary reference U.S. Government activity |
| 76186 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
NSN 4820-01-391-6445 is a Indicator,valve Opening, classified under FSC 4820, Valves, Nonpowered. Status: active.
Key specifications for 4820-01-391-6445: End Item Identification: CLA-VAL CO, VALVE, MODEL 181M-1; Material: NICKEL ALLOY CASE. 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.