The Hose Assembly,air Duct, cataloged under National Stock Number 4720-01-031-1707, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Bemco, Inc. Government technical data includes 11 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-031-1707 |
| Primary Part Number | BE661-3 |
| Item Name | Hose Assembly,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Bemco, Inc |
| Status | ACTIVE |
| Measuring Method and Length | 3.000 INCHES NOMINAL OVERALL IN |
| Connection Type | COUPLING FIRST END |
| Style Designator | FULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS |
| Coupling Style | PLAIN FLANGE FIRST END |
| Cross-Sectional Shape Style | ROUND |
| Wall Thickness | 0.550 INCHES MAXIMUM IN |
| Inside Diameter | 8.900 INCHES NOMINAL FIRST END IN |
| Material | STEEL REINFORCING WIRE |
| Material | FIBERGLASS AND RUBBER SILICONE CLASS Q THIRD PLY |
| Material | FIBERGLASS AND RUBBER SILICONE CLASS Q FIRST PLY |
| Material | FIBERGLASS AND RUBBER SILICONE CLASS Q SECOND PLY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| BE661-3 | Bemco, Inc (USA) |
| Reference | Meaning |
|---|---|
| 204-66616 | D/9 Drawing number reference only U.S. Government activity |
| BE661 | D/9 Drawing number reference only Bemco, Inc |
| 204-66616-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4720-01-031-1707 is a Hose Assembly,air Duct, manufactured by Bemco, Inc, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-01-031-1707 has 1 manufacturer part number on file: BE661-3 (Bemco, Inc).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-163-7860. Verify interchangeability with system specifications before substitution.
Key specifications for BE661-3: Measuring Method and Length: 3.000 INCHES NOMINAL OVERALL IN; Connection Type: COUPLING FIRST END; Style Designator: FULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS; Coupling Style: PLAIN FLANGE FIRST END. 11 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.
NSN 4720-01-031-1707 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.