The Reducer,hose,fire Fighting, cataloged under National Stock Number 4210-01-657-1788, is classified within Federal Supply Class 4210 (Firefighting Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Kochek Company, Llc Dba Kochek Co Inc. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4210-01-657-1788 |
| Primary Part Number | 53R454S |
| Item Name | Reducer,hose,fire Fighting |
| FSC / FSG | 4210 / 42 — Firefighting Equipment |
| Manufacturer | Kochek Company, Llc Dba Kochek Co Inc |
| Status | ACTIVE |
| Nominal Overall Length | 3.50 INCHES IN |
| Connection Type | THREADED INTERNAL HOSE ALL ENDS |
| Nominal Thread Size | 4.00 INCHES SECOND END IN |
| Nominal Thread Size | 4.50 INCHES FIRST END IN |
| Thread Quantity Per Inch | 4 ALL ENDS |
| Thread Series Designator | NH ALL ENDS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 53R454S PRIMARY | Kochek Company, Llc Dba Kochek Co Inc (USA) |
| Reference | Meaning |
|---|---|
| 53R454S REV 1 | D/9 Drawing number reference only Kochek Company, Llc Dba Kochek Co Inc |
NSN 4210-01-657-1788 is a Reducer,hose,fire Fighting, manufactured by Kochek Company, Llc Dba Kochek Co Inc, classified under FSC 4210, Firefighting Equipment. Status: active.
NSN 4210-01-657-1788 has 1 manufacturer part number on file: 53R454S (Kochek Company, Llc Dba Kochek Co Inc).
Key specifications for 53R454S: Nominal Overall Length: 3.50 INCHES IN; Connection Type: THREADED INTERNAL HOSE ALL ENDS; Nominal Thread Size: 4.00 INCHES SECOND END IN; Nominal Thread Size: 4.50 INCHES FIRST END IN. 6 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.