The Valve,check, cataloged under National Stock Number 4820-01-053-2842, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Essex Industries, Inc. Dba Essex Industries. Government technical data includes 14 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-053-2842 |
| Primary Part Number | K1120-4-7 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Essex Industries, Inc. Dba Essex Industries |
| Status | ACTIVE |
| Surface Treatment Document and Classification | MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE |
| Connection Style | PLAIN BEVELED (PIPE) SECOND END |
| Connection Type | UNTHREADED EXTERNAL PIPE SECOND END |
| Connection Type | THREADED INTERNAL PIPE FIRST END |
| Style Designator | STRAIGHT THRU |
| Thread Direction | RIGHT-HAND FIRST END |
| Nominal Thread Size | 0.438 INCHES FIRST END IN |
| Maximum Operating Temp | 200.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Surface Treatment | PASSIVATE |
| Media for Which Designed | AIR SINGLE RESPONSE |
| Thread Class | 3B FIRST END |
| Material | STEEL COMP 303 OR STEEL COMP 303SE OR STEEL COMP 303 PLUS X BODY |
| Thread Series Designator | UNIFIED NATIONAL JOINT FINE (UNJF) FIRST 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 | F |
| Part Number | Manufacturer |
|---|---|
| K1120-4-7 PRIMARY | Essex Industries, Inc. Dba Essex Industries (USA) |
| Reference | Meaning |
|---|---|
| C9548-1 | 7/2 Vendor item drawing reference U.S. Government activity |
| 4820PL0655353 | 6/9 Informative reference only Jednolity Indeks Materialowy - Uniform Material Index |
NSN 4820-01-053-2842 is a Valve,check, manufactured by Essex Industries, Inc. Dba Essex Industries, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-053-2842 has 1 manufacturer part number on file: K1120-4-7 (Essex Industries, Inc. Dba Essex Industries).
Key specifications for K1120-4-7: Surface Treatment Document and Classification: MIL-S-5002 MIL SPEC SINGLE TREATMENT RESPONSE; Connection Style: PLAIN BEVELED (PIPE) SECOND END; Connection Type: UNTHREADED EXTERNAL PIPE SECOND END; Connection Type: THREADED INTERNAL PIPE FIRST END. 14 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.