The Hose Assembly,air Duct,air Breat, cataloged under National Stock Number 4240-01-550-1054, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. The manufacturer of record is Kirby Morgan Dive Systems Inc. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4240-01-550-1054 |
| Primary Part Number | 255-020 |
| Item Name | Hose Assembly,air Duct,air Breat |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Kirby Morgan Dive Systems Inc |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| 255-020 PRIMARY | Kirby Morgan Dive Systems Inc (USA) |
NSN 4240-01-550-1054 is a Hose Assembly,air Duct,air Breat, manufactured by Kirby Morgan Dive Systems Inc, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-550-1054 has 1 manufacturer part number on file: 255-020 (Kirby Morgan Dive Systems Inc).
2 possible matches (shared part number, not a government interchangeability claim): 3448-01-688-1601, 5995-01-706-8194. Verify interchangeability with system specifications before substitution.
Key specifications for 255-020: Special Features: WITH QUICK DISCONNECTING LOCKING SLEEVE; Part Name Assigned by Controlling Agency: D.S.I. SCUBA REGULATOR HOSE; End Item Identification: SUPERLITE 27B-KMB28B-DCS2 A HELMET CHIN STRAP PAD. 0 specifications are documented in the U.S. Government catalog.
Possible hazard — SDS may be required (DLA HMIC P). 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.