The Muffler,exhaust, cataloged under National Stock Number 2990-00-494-9490, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 16 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-494-9490 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Inlet Outside Diameter | 1.625 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | ON SIDE OF BODY 5.500 IN. C OF INLET TO END OF BODY IN |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 3.250 INCHES NOMINAL IN |
| Inlet Projection Length | 3.250 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | STRAIGHT THROUGH |
| Tube Quantity | 1 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Nonconnection Outlet Location | ON SIDE OF BODY |
| Nonconnection Outlet Type and Quantity | 34 PERFORATED |
| Nonconnection Outlet Size | O.250 IN. DIA IN |
| Surface Treatment | PAINT |
| Inlet Inside Diameter | 1.500 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL 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 |
| Reference | Meaning |
|---|---|
| 5091496-00 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-00-494-9490 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-494-9490: Inlet Outside Diameter: 1.625 INCHES NOMINAL SINGLE INLET IN; Inlet Location: ON SIDE OF BODY 5.500 IN. C OF INLET TO END OF BODY IN; Coolant Type: AIR; Design Type: DRY. 16 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.