The Voicemitter-Outlet Valve, cataloged under National Stock Number 4240-00-591-5158, is classified within Federal Supply Class 4240 (Safety and Rescue Equipment) of the Fire Fighting, Rescue, and Safety Equipment group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4240-00-591-5158 |
| Item Name | Voicemitter-Outlet Valve |
| FSC / FSG | 4240 / 42 — Safety and Rescue Equipment |
| Status | ACTIVE |
| General Characteristics Item Description | CONSISTS OF:DIAPHRAGM,MYLAR FILM,TYPE C;RING,SEALING,ALUM ALY,SPEC QQ-A-250/8;RING,RETAINING,ALUM ALY,SPEC QQA-250/8;GASKET,RUBBER,SPEC PD197-54-988;FRAME,ALUM ALY,SPEC QQ-A-250/8;BAFFLE,FRONT,CUPPED AND INNER,ALUM ALY,SPEC QQ-A-250/11 AND 8;CUP,INNER,ALUM ALY,SPEC QQ-A-250/8;GASKET,BAFFLE,RUBBER,SPEC PD197-54-988;DIAPHRAGM,ASSY;FRAME AND RETAINING RING ASSY;SEAT,OUTLET VALVE,ALUM ALY DIE CASTING,SPEC QQ-A-591;DISC,OUTLET VALVE,RUBBER,SPEC MIL-D-0010132 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL F — Mutilate — Cut |
| Hazard | Possible hazard — SDS may be required (DLA HMIC P) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| D5-81-3 | 3/2 Design control — primary reference U.S. Government activity |
NSN 4240-00-591-5158 is a Voicemitter-Outlet Valve, classified under FSC 4240, Safety and Rescue Equipment. Status: active.
Key specifications for 4240-00-591-5158: General Characteristics Item Description: CONSISTS OF:DIAPHRAGM,MYLAR FILM,TYPE C;RING,SEALING,ALUM ALY,SPEC QQ-A-250/8;RING,RETAINING,ALUM ALY,SPEC QQA-250/8;GASKET,RUBBER,SPEC PD197-54-988;FRAME,ALUM ALY,SPEC QQ-A-250/8;BAFFLE,FRONT,CUPPED AND INNER,ALUM ALY,SPEC QQ-A-250/11 AND 8;CUP,INNER,ALUM ALY,SPEC QQ-A-250/8;GASKET,BAFFLE,RUBBER,SPEC PD197-54-988;DIAPHRAGM,ASSY;FRAME AND RETAINING RING ASSY;SEAT,OUTLET VALVE,ALUM ALY DIE CASTING,SPEC QQ-A-591;DISC,OUTLET VALVE,RUBBER,SPEC MIL-D-0010132; End Item Identification: 4240-00-542-4450 SM,4240-00-542-4451 MED,4240-00-542-4452 LG. 1 specification is 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 4240-00-591-5158 has DEMIL Code F. 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.