The Muffler,exhaust, cataloged under National Stock Number 2990-01-285-8422, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-285-8422 |
| Primary Part Number | 1374097 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Inlet Location | LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 7.000 INCHES NOMINAL IN |
| Muffler Design | STRAIGHT THROUGH |
| Inlet Connection Type | FLANGE SINGLE INLET |
| Body Shape | ROUND |
| Material | STEEL CORROSION RESISTING LOCATION NOT OTHERWISE SPECIFIED |
| 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 |
|---|---|
| MFM07-0214 | Donaldson Company, Inc. (USA) |
| 1374097 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
| Reference | Meaning |
|---|---|
| 7N2321 | 5/9 Secondary reference Caterpillar Inc Div Caterpillar Defense |
NSN 2990-01-285-8422 is a Muffler,exhaust, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-285-8422 has 2 manufacturer part numbers on file: MFM07-0214 (Donaldson Company, Inc.), 1374097 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 1374097: Inlet Location: LOCATED IN END SECTION OF BODY; Coolant Type: AIR; Design Type: DRY; Overall Diameter: 7.000 INCHES NOMINAL IN. 8 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.