The Valve,vacuum Breaking, cataloged under National Stock Number 4820-01-439-9727, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is International Valve Corp Dba Check-All Valve Mfg. Co.. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Valve,vacuum Breaking |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Rolls-Royce Corporation (CAGE 63005); International Valve Corp Dba Check-All Valve Mfg. Co. (CAGE 28396) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-439-9727 |
| Primary Part Number | CAV-4311-SS-V-.125 |
| Item Name | Valve,vacuum Breaking |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | International Valve Corp Dba Check-All Valve Mfg. Co. |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 23059008 ITEM 131 | Rolls-Royce Corporation (USA) |
| CAV-4311-SS-V-.125 PRIMARY | International Valve Corp Dba Check-All Valve Mfg. Co. (USA) |
| 23059065-04 | Rolls-Royce Corporation (USA) |
| Reference | Meaning |
|---|---|
| 23059065 | 7/1 Vendor item drawing reference Rolls-Royce Corporation |
| 23059008 | D/9 Drawing number reference only Rolls-Royce Corporation |
NSN 4820-01-439-9727 is a Valve,vacuum Breaking, manufactured by International Valve Corp Dba Check-All Valve Mfg. Co., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-439-9727 has 3 manufacturer part numbers on file: 23059008 ITEM 131 (Rolls-Royce Corporation), CAV-4311-SS-V-.125 (International Valve Corp Dba Check-All Valve Mfg. Co.), 23059065-04 (Rolls-Royce Corporation).
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.