The Muffler,exhaust,valve, cataloged under National Stock Number 4820-01-105-9491, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Pneumatic Division. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-105-9491 |
| Primary Part Number | EM25 |
| Item Name | Muffler,exhaust,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Pneumatic Division |
| Status | ACTIVE |
| General Characteristics Item Description | 1/4 IN. NPTF PORT;40 MICRON SINTERED BRONZE ELEMENT IN |
| 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 |
|---|---|
| EM25 PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Pneumatic Division (USA) |
| Reference | Meaning |
|---|---|
| 60244-90045 | 5/2 Secondary reference U.S. Government activity |
| 593-6961310 PC | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| EM-25-1/4 | 5/9 Secondary reference Parker-Hannifin Corporation Dba Pneutronics Div Hose Products Division |
NSN 4820-01-105-9491 is a Muffler,exhaust,valve, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Pneumatic Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-105-9491 has 1 manufacturer part number on file: EM25 (Parker-Hannifin Corporation Dba Pneutronics Div Pneumatic Division).
Key specifications for EM25: General Characteristics Item Description: 1/4 IN. NPTF PORT;40 MICRON SINTERED BRONZE ELEMENT IN. 1 specification is documented in the U.S. Government catalog.
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.