The Hose Assembly,air Duct, cataloged under National Stock Number 4720-01-490-3657, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. Government technical data includes 10 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-490-3657 |
| Item Name | Hose Assembly,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Status | ACTIVE |
| Measuring Method and Length | 4.000 INCHES NOMINAL OVERALL IN |
| Connection Style | ROUND FIRST END |
| Connection Type | PREFORMED FIRST END |
| Style Designator | BOX SECTION |
| Cross-Sectional Shape Style | ROUND |
| Inside Diameter | 3.500 INCHES NOMINAL FIRST END IN |
| End Overall Length | 1.000 INCHES NOMINAL FIRST END IN |
| End Inside Diameter | 3.500 INCHES NOMINAL FIRST END IN |
| End Inside Length | 1.000 INCHES NOMINAL FIRST END IN |
| Material | PLASTIC OR FIBERGLASS ALL PLIES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| 204-67108-2 | 3/2 Design control — primary reference U.S. Government activity |
| 204-67108 | D/9 Drawing number reference only U.S. Government activity |
NSN 4720-01-490-3657 is a Hose Assembly,air Duct, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
Key specifications for 4720-01-490-3657: Measuring Method and Length: 4.000 INCHES NOMINAL OVERALL IN; Connection Style: ROUND FIRST END; Connection Type: PREFORMED FIRST END; Style Designator: BOX SECTION. 10 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.