The Muffler,exhaust, cataloged under National Stock Number 2990-01-159-7940, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 14 specifications, cited from the U.S. Government catalog. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog.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 | 2990-01-159-7940 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| Inlet Outside Diameter | 5.151 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | LOCATED AT LOWER END OF MUFFLER |
| Design Type | DRY |
| Outlet Inside Diameter | 4.810 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Projection Length | 12.500 INCHES NOMINAL SINGLE INLET IN |
| Outlet Outside Diameter | 5.151 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | OVAL |
| Surface Treatment | PAINT |
| Inlet Inside Diameter | 4.810 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | LOCATED AT UPPER END OF MUFFLER |
| 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 |
|---|---|
| 681655C1 | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-01-159-7940 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-01-159-7940: Operating Position: UNIVERSAL; Overall Height: 15.000 INCHES NOMINAL IN; Inlet Outside Diameter: 5.151 INCHES NOMINAL SINGLE INLET IN; Inlet Location: LOCATED AT LOWER END OF MUFFLER. 14 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.