The Valve,check, cataloged under National Stock Number 4820-01-412-6822, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Link-Belt Cranes, L.p., Lllp. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-412-6822 |
| Primary Part Number | 3A9408 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Link-Belt Cranes, L.p., Lllp |
| Status | ACTIVE |
| Connection Style | PLAIN (PIPE) ALL ENDS |
| Connection Type | THREADED EXTERNAL PIPE ALL ENDS |
| Nominal Thread Size | 0.750 INCHES ALL ENDS IN |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Series Designator | NPT ALL ENDS |
| 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 |
|---|---|
| 3A9408 | Link-Belt Cranes, L.p., Lllp (USA) |
| Reference | Meaning |
|---|---|
| 1700076 | 3/9 Design control — primary reference Sycon Corp |
NSN 4820-01-412-6822 is a Valve,check, manufactured by Link-Belt Cranes, L.p., Lllp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-412-6822 has 1 manufacturer part number on file: 3A9408 (Link-Belt Cranes, L.p., Lllp).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-505-5483. Verify interchangeability with system specifications before substitution.
Key specifications for 3A9408: Connection Style: PLAIN (PIPE) ALL ENDS; Connection Type: THREADED EXTERNAL PIPE ALL ENDS; Nominal Thread Size: 0.750 INCHES ALL ENDS IN; Media for Which Designed: AIR SINGLE RESPONSE. 6 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.