The Hose Assembly,air Duct, cataloged under National Stock Number 4720-00-025-5737, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Smith and Smith Aircraft Intl Ltd. Government technical data includes 13 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4720-00-025-5737 |
| Primary Part Number | 159-42184 |
| Item Name | Hose Assembly,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Smith and Smith Aircraft Intl Ltd |
| Status | ACTIVE |
| Measuring Method and Length | 3.656 INCHES NOMINAL OVERALL IN |
| Inside Width | 4.500 INCHES NOMINAL FIRST END IN |
| Inside Length | 7.125 INCHES NOMINAL FIRST END IN |
| Connection Type | COUPLING FIRST END |
| Style Designator | FULLY CONVOLUTED |
| Coupling Style | RAISED FACE FLANGE FIRST END |
| Material Document and Classification | MIL-P-21099,TYPE 2 MIL SPEC SINGLE MATERIAL RESPONSE SECOND END COUPLING |
| Cross-Sectional Shape Style | OVAL |
| Wall Thickness | 0.125 INCHES NOMINAL IN |
| Material | RUBBER CHLOROPRENE CLASS CR SINGLE PLY |
| Material | COPPER ALLOY REINFORCING WIRE |
| Material | COTTON AND RUBBER SYNTHETIC SECOND END COUPLING |
| Material | RUBBER CHLOROPRENE CLASS CR AND COTTON FIRST END COUPLING |
| 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 |
|---|---|
| 159-42184 PRIMARY | Smith and Smith Aircraft Intl Ltd (USA) |
| Reference | Meaning |
|---|---|
| 159-42184 | 5/9 Secondary reference Smith and Smith Aircraft Co |
| 159-42184 | 5/9 Secondary reference U.S. Government activity |
NSN 4720-00-025-5737 is a Hose Assembly,air Duct, manufactured by Smith and Smith Aircraft Intl Ltd, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-00-025-5737 has 1 manufacturer part number on file: 159-42184 (Smith and Smith Aircraft Intl Ltd).
Key specifications for 159-42184: Measuring Method and Length: 3.656 INCHES NOMINAL OVERALL IN; Inside Width: 4.500 INCHES NOMINAL FIRST END IN; Inside Length: 7.125 INCHES NOMINAL FIRST END IN; Connection Type: COUPLING FIRST END. 13 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.