The Deflector,valve,mask, cataloged under National Stock Number 4240-01-286-1842, 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 Mine Safety Appliances Company. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4240-01-286-1842 |
| Primary Part Number | 305049 |
| Item Name | Deflector,valve,mask |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Manufacturer | Mine Safety Appliances Company |
| Status | ACTIVE |
| General Characteristics Item Description | NEXT ASSEMBLY ARE P/NS 88115004-1,88115004-2,88115004-3,CAGEC 07878 |
| Criticality Code Justification | AGAV |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 305049 | Mine Safety Appliances Company (USA) |
| Reference | Meaning |
|---|---|
| 305049 | 5/9 Secondary reference Mine Safety Appliances Co |
| 88115031 | 3/2 Design control — primary reference U.S. Government activity |
| 839-764 | 5/9 Secondary reference Avox Systems Inc Dba Avox Systems Inc |
NSN 4240-01-286-1842 is a Deflector,valve,mask, manufactured by Mine Safety Appliances Company, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
NSN 4240-01-286-1842 has 1 manufacturer part number on file: 305049 (Mine Safety Appliances Company).
Key specifications for 305049: General Characteristics Item Description: NEXT ASSEMBLY ARE P/NS 88115004-1,88115004-2,88115004-3,CAGEC 07878; Criticality Code Justification: AGAV; End Item Identification: MASK,CHEMICAL-BIOLOGICAL,MODEL MCU-2/P AND MCU-2A/P,4240-01-175-3443,4240-01-175-3444,4240-01-175-3445,4240-01-284-3615,4240-01-284-3616 AND 4240-01-284-3617 A. 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.
NSN 4240-01-286-1842 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.