The Valve,check, cataloged under National Stock Number 4820-01-309-3799, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Gt Development Corp. Government technical data includes 15 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-309-3799 |
| Primary Part Number | 261-3 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Gt Development Corp |
| Status | ACTIVE |
| Connection Style | PLAIN (TUBE) SECOND END |
| Connection Style | PLAIN (PIPE) FIRST END |
| Mounting Position | VERTICAL |
| Connection Type | THREADED EXTERNAL TUBE SECOND END |
| Connection Type | THREADED EXTERNAL PIPE FIRST END |
| Style Designator | ANGLE |
| Thread Direction | RIGHT-HAND ALL ENDS |
| Nominal Thread Size | 0.438 INCHES SECOND END IN |
| Nominal Thread Size | 0.250 INCHES FIRST END IN |
| Thread Class | 2A SECOND END A |
| Thread Quantity Per Inch | 24 SECOND END |
| Material | COPPER ALLOY OR STEEL CORROSION RESISTING BODY |
| Thread Series Designator | PTF-SAE SHORT FIRST END |
| Thread Series Designator | UNS SECOND END |
| 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 |
|---|---|
| 261-3 PRIMARY | Gt Development Corp (USA) |
| Reference | Meaning |
|---|---|
| 12356942 | 5/9 Secondary reference U S Army Tank Automotive Command Amsta-Im-Mm |
| 12375696 | 7/2 Vendor item drawing reference U S Army Tank Automotive Command Amsta-Im-Mm |
| 261-3 | 5/9 Secondary reference U.S. Government activity |
NSN 4820-01-309-3799 is a Valve,check, manufactured by Gt Development Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-309-3799 has 1 manufacturer part number on file: 261-3 (Gt Development Corp).
Key specifications for 261-3: Connection Style: PLAIN (TUBE) SECOND END; Connection Style: PLAIN (PIPE) FIRST END; Mounting Position: VERTICAL; Connection Type: THREADED EXTERNAL TUBE SECOND END. 15 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.