The Hose,air Duct, cataloged under National Stock Number 4720-00-028-0616, is classified within Federal Supply Class 4720 (Hose and Flexible Tubing) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is Flexible Technologies Inc. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Hose,air Duct |
| FSC / FSG | 4720 — Hose and Flexible Tubing (FSG 47) |
| Manufacturers | Northrop Grumman Systems Corporation (CAGE 26512); Flexible Technologies Inc (CAGE 30299) |
| Parameter | Value |
|---|---|
| NSN | 4720-00-028-0616 |
| Primary Part Number | FT-337B-3-132 |
| Item Name | Hose,air Duct |
| FSC / FSG | 4720 / 47 — Hose and Flexible Tubing |
| Manufacturer | Flexible Technologies Inc |
| Status | ACTIVE |
| 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 |
|---|---|
| GH12A-3-132 | Northrop Grumman Systems Corporation (USA) |
| FT-337B-3-132 PRIMARY | Flexible Technologies Inc (USA) |
| FT-2021-3-132 PRIMARY | Flexible Technologies Inc (USA) |
| FT-2022-3-132 PRIMARY | Flexible Technologies Inc (USA) |
| Reference | Meaning |
|---|---|
| FT-2021 | D/9 Drawing number reference only Flexible Technologies Inc |
| GH12A | D/9 Drawing number reference only Northrop Grumman Systems Corporation |
| FT-337B | D/9 Drawing number reference only Flexible Technologies Inc |
| FT-337A-3-132 | 5/9 Secondary reference Flexible Technologies Inc |
NSN 4720-00-028-0616 is a Hose,air Duct, manufactured by Flexible Technologies Inc, classified under FSC 4720, Hose and Flexible Tubing. Status: active.
NSN 4720-00-028-0616 has 4 manufacturer part numbers on file: GH12A-3-132 (Northrop Grumman Systems Corporation), FT-337B-3-132 (Flexible Technologies Inc), FT-2021-3-132 (Flexible Technologies Inc), FT-2022-3-132 (Flexible Technologies Inc).
1 possible match (shared part number, not a government interchangeability claim): 4720-00-720-1023. Verify interchangeability with system specifications before substitution.
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.