The Muffler,exhaust, cataloged under National Stock Number 2990-00-657-8612, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Maremont Corp. Government technical data includes 20 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-657-8612 |
| Primary Part Number | EX1394 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Maremont Corp |
| Status | ACTIVE |
| Operating Position | VERTICAL |
| FSC Application Data | GASOLINE ENGINE,NONAIRCRAFT |
| Inlet Outside Diameter | 4.1106 INCHES MINIMUM AND 4.1356 INCHES MAXIMUM SINGLE INLET IN |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Outlet Inside Diameter | 5.9044 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 2.000 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 5 |
| Muffler Design | BAFFLE |
| Outlet Outside Diameter | 6.000 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Outlet Integral Tail Pipe Length | 12.000 INCHES NOMINAL FIRST OUTLET IN |
| Surface Treatment | ALUMINUM |
| Inlet Inside Diameter | 4.015 INCHES MINIMUM AND 4.040 INCHES MAXIMUM SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 1.500 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | LOCATED 8-1/16 IN. C TO C CENTER LINE 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 |
|---|---|
| EX1394 PRIMARY | Maremont Corp (USA) |
NSN 2990-00-657-8612 is a Muffler,exhaust, manufactured by Maremont Corp, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-657-8612 has 1 manufacturer part number on file: EX1394 (Maremont Corp).
Key specifications for EX1394: Operating Position: VERTICAL; Overall Height: 46.000 INCHES NOMINAL IN; FSC Application Data: GASOLINE ENGINE,NONAIRCRAFT; Inlet Outside Diameter: 4.1106 INCHES MINIMUM AND 4.1356 INCHES MAXIMUM SINGLE INLET IN. 20 specifications are 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.