The Muffler,exhaust, cataloged under National Stock Number 2990-00-997-2298, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Cummins Filtration Inc.. 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-997-2298 |
| Primary Part Number | 12123N |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Cummins Filtration Inc. |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| FSC Application Data | ENGINE EXHAUST SYSTEM,NONAIRCRAFT |
| Outlet Thread Size | 1-1/4-11-1/2 FIRST OUTLET |
| Inlet Location | CENTRALLYLOCATED IN END SECTION OF BODY |
| Design Type | DRY |
| Overall Diameter | 3.500 INCHES NOMINAL IN |
| Outlet Thread Direction | RIGHT-HAND FIRST OUTLET |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 1.125 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 6 |
| Muffler Design | BAFFLE |
| Thread Location | EXTERNAL FIRST OUTLET |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 1-1/4-11-1/2 SINGLE INLET |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 1.125 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | THREADED 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 |
| Part Number | Manufacturer |
|---|---|
| 12123N PRIMARY | Cummins Filtration Inc. (USA) |
| Reference | Meaning |
|---|---|
| 155B873 | 5/9 Secondary reference Cummins Power Generation Inc. |
| 155-0873 | 5/9 Secondary reference Cummins Power Generation Inc. |
| 155-873 | 5/9 Secondary reference Cummins Power Generation Inc. |
NSN 2990-00-997-2298 is a Muffler,exhaust, manufactured by Cummins Filtration Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-997-2298 has 1 manufacturer part number on file: 12123N (Cummins Filtration Inc.).
Key specifications for 12123N: Operating Position: HORIZONTAL; FSC Application Data: ENGINE EXHAUST SYSTEM,NONAIRCRAFT; Outlet Thread Size: 1-1/4-11-1/2 FIRST OUTLET; Inlet Location: CENTRALLYLOCATED IN END SECTION OF BODY. 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.