The Muffler,exhaust, cataloged under National Stock Number 2990-01-391-0806, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 6 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-391-0806 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 7.470 INCHES MINIMUM AND 7.530 INCHES MAXIMUM IN |
| Muffler Design | STRAIGHT THROUGH |
| Body Shape | ROUND |
| Material | PLASTIC 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 |
|---|---|
| 056056-10 | 3/2 Design control — primary reference U.S. Government activity |
| 6673986 | 7/2 Vendor item drawing reference Naval Sea Systems Command |
NSN 2990-01-391-0806 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-01-391-0806: Coolant Type: AIR; Design Type: DRY; Overall Diameter: 7.470 INCHES MINIMUM AND 7.530 INCHES MAXIMUM IN; Muffler Design: STRAIGHT THROUGH. 6 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.