The Valve,regulating,system Pressure, cataloged under National Stock Number 4820-01-689-9778, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Transdigm Inc Div Adelwiggins Group. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Item Name | Valve,regulating,system Pressure |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Transdigm Inc Div Adelwiggins Group (CAGE 21392); Leonardo Spa Aeronautics Division - Venegono Superiore Site (CAGE A2142) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-689-9778 |
| Primary Part Number | R1029A |
| Item Name | Valve,regulating,system Pressure |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Transdigm Inc Div Adelwiggins Group |
| 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 |
NSN 4820-01-689-9778 is a Valve,regulating,system Pressure, manufactured by Transdigm Inc Div Adelwiggins Group, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-689-9778 has 2 manufacturer part numbers on file: R1029A (Transdigm Inc Div Adelwiggins Group), R1029A (Leonardo Spa Aeronautics Division - Venegono Superiore Site).
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.