The Muffler,exhaust, cataloged under National Stock Number 2990-01-212-7664, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. Government technical data includes 13 specifications, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 2990-01-212-7664 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Status | ACTIVE |
| Operating Position | UNIVERSAL |
| Inlet Outside Diameter | 0.405 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | END OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 0.855 INCHES NOMINAL IN |
| Inlet Projection Length | 0.415 INCHES NOMINAL SINGLE INLET IN |
| Muffler Design | MULTIPASS W/INTEGRAL SPARK ARRESTOR |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Surface Treatment | OXIDE |
| Inlet Inside Diameter | 0.250 INCHES NOMINAL SINGLE INLET IN |
| Material | COPPER AND 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 |
|---|---|
| 6189-27-2 | 3/2 Design control — primary reference U.S. Government activity |
| 6189-27-2 | 3/9 Design control — primary reference Air Dry Co of America, Llc |
NSN 2990-01-212-7664 is a Muffler,exhaust, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
Key specifications for 2990-01-212-7664: Operating Position: UNIVERSAL; Inlet Outside Diameter: 0.405 INCHES NOMINAL SINGLE INLET IN; Inlet Location: END OF BODY; Coolant Type: AIR. 13 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.