The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-425-1011, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Provision, Inc. Dba Provision Inc. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-425-1011 |
| Primary Part Number | 4950 |
| Item Name | Valve,vacuum Breaking |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Provision, Inc. Dba Provision Inc |
| Status | ACTIVE |
| First End Thread Series Designator | UNF |
| First End Thread Direction | RIGHT-HAND |
| First End Connection Type | THREADED INTERNAL TUBE |
| Material | STEEL CORROSION RESISTING BODY |
| Media for Which Designed | OXYGEN, LIQUID OR NITROGEN, LIQUID |
| Furnished Items | CAP |
| First End Nominal Thread Size | 0.250 INCHES IN |
| 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 |
|---|---|
| 1602AS181-1 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 1602AS181 | Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier (USA) |
| 4950 PRIMARY | Provision, Inc. Dba Provision Inc (USA) |
NSN 4820-01-425-1011 is a Valve,vacuum Breaking, manufactured by Provision, Inc. Dba Provision Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-425-1011 has 3 manufacturer part numbers on file: 1602AS181-1 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 1602AS181 (Naval Air Systems Command Managed Original Design Activity Not Material/parts Supplier), 4950 (Provision, Inc. Dba Provision Inc).
Key specifications for 4950: First End Thread Series Designator: UNF; First End Thread Direction: RIGHT-HAND; First End Connection Type: THREADED INTERNAL TUBE; Special Features: CLEANED FOR OXYGEN USE. 7 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.