The Hose Assembly,air Breathing, cataloged under National Stock Number 4240-01-509-5489, 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 David Perkins Enterprises, Inc Div DP Enterprises, Inc. Government technical data includes 2 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-01-509-5489 |
| Primary Part Number | DP6640965 |
| Item Name | Hose Assembly,air Breathing |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | David Perkins Enterprises, Inc Div DP Enterprises, Inc |
| Status | ACTIVE |
| Connection Type | THREADED BOTH ENDS |
| Coupling Style | BEADED BOTH ENDS |
| 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 |
|---|---|
| DP6640965 PRIMARY | David Perkins Enterprises, Inc Div DP Enterprises, Inc (USA) |
| Reference | Meaning |
|---|---|
| DP092756 | 5/9 Secondary reference David Perkins Enterprises, Inc Div DP Enterprises, Inc |
| 263310001-0268A | 3/2 Design control — primary reference U.S. Government activity |
| 801-6640965ASSY268 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4240-01-509-5489 is a Hose Assembly,air Breathing, manufactured by David Perkins Enterprises, Inc Div DP Enterprises, Inc, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-509-5489 has 1 manufacturer part number on file: DP6640965 (David Perkins Enterprises, Inc Div DP Enterprises, Inc).
Key specifications for DP6640965: Connection Type: THREADED BOTH ENDS; Coupling Style: BEADED BOTH ENDS; Special Features: CONNECTION TYPE: GROUND JOINT EXTERNALLY THREADED TAILPIECE W/UNION NUT BOTH ENDS. 2 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.