The Muffler,exhaust, cataloged under National Stock Number 2990-00-703-1797, 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16 specifications, cited from the U.S. Government catalog. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-703-1797 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Inlet Thread Location | EXTERNAL SINGLE INLET |
| Inlet Projection Length | 5.000 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | STRAIGHT THROUGH |
| Tube Quantity | 4 |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | RECTANGULAR |
| Nonconnection Outlet Location | ON SIDES OF BODY |
| Nonconnection Outlet Type and Quantity | 69600 PERFORATED |
| Inlet Thread Size | 4-8 SINGLE INLET |
| Nonconnection Outlet Size | 0.062 IN. DIA IN |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Material | ALUMINUM ALLOY 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 |
|---|---|
| 403060-40S | 5/9 Secondary reference U.S. Government activity |
| 0311816 4Q-3060-40S | 3/2 Design control — primary reference U.S. Government activity |
| 50225-EX8323-328 | 5/9 Secondary reference U.S. Government activity |
| 4A3060-40S | 5/9 Secondary reference U.S. Government activity |
NSN 2990-00-703-1797 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-00-703-1797: Overall Height: 8.000 INCHES NOMINAL IN; Inlet Location: CENTRALLY LOCATED IN END SECTION OF BODY; 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.