The Hose Assembly,air Duct, cataloged under National Stock Number 4720-01-031-1098, 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 12 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4720-01-031-1098 |
| Primary Part Number | BE661-15 |
| Item Name | Hose Assembly,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Bemco, Inc |
| Status | ACTIVE |
| Measuring Method and Length | 9.500 INCHES NOMINAL OVERALL IN |
| Connection Type | COUPLING FIRST END |
| Style Designator | FULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS |
| Coupling Style | INTERNAL COUPLING CLAMP-LOCKING FIRST END |
| Cross-Sectional Shape Style | ROUND |
| Wall Thickness | 0.575 INCHES MAXIMUM IN |
| Inside Diameter | 6.850 INCHES NOMINAL FIRST END IN |
| Surface Treatment | ANODIZE FIRST END COUPLING |
| 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 |
|---|---|
| BE661-15 PRIMARY | Bemco, Inc (USA) |
| Reference | Meaning |
|---|---|
| BE661 | D/9 Drawing number reference only Bemco, Inc |
NSN 4720-01-031-1098 is a Hose Assembly,air Duct, manufactured by Bemco, Inc, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-01-031-1098 has 1 manufacturer part number on file: BE661-15 (Bemco, Inc).
2 possible matches (shared part number, not a government interchangeability claim): 4720-01-031-1707, 4720-01-163-7860. Verify interchangeability with system specifications before substitution.
Key specifications for BE661-15: Measuring Method and Length: 9.500 INCHES NOMINAL OVERALL IN; Connection Type: COUPLING FIRST END; Style Designator: FULLY CONVOLUTED W/ WIRE RINGS BETWEEN CONVOLUTIONS; Coupling Style: INTERNAL COUPLING CLAMP-LOCKING FIRST END. 12 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 4720-01-031-1098 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.