The Muffler,exhaust, cataloged under National Stock Number 2990-00-424-4540, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Cummins Power Generation Inc.. Government technical data includes 13 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-424-4540 |
| Primary Part Number | 12903A |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Cummins Power Generation Inc. |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Outlet Flange Mounting Provision and Quantity | 2 HOLES FIRST OUTLET |
| Design Type | DRY |
| Inlet Thread Location | INTERNAL SINGLE INLET |
| Baffle Quantity | 1 |
| Muffler Design | BAFFLE |
| Outlet Flange Shape | OVAL FIRST OUTLET |
| Inlet Connection Type | THREADED SINGLE INLET |
| Body Shape | ROUND |
| Outlet Connection Type | FLANGE FIRST OUTLET |
| Outlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2990-00-424-4540 is a Muffler,exhaust, manufactured by Cummins Power Generation Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-424-4540 has 2 manufacturer part numbers on file: 12903A (Cummins Power Generation Inc.), 155-410 (Cummins Power Generation Inc.).
1 possible match (shared part number, not a government interchangeability claim): 3020-01-298-9399. Verify interchangeability with system specifications before substitution.
Key specifications for 12903A: Operating Position: HORIZONTAL; Inlet Location: CENTRALLY LOCATED IN END SECTION OF BODY; Coolant Type: AIR; Outlet Flange Mounting Provision and Quantity: 2 HOLES FIRST OUTLET. 13 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.