The Muffler,exhaust, cataloged under National Stock Number 2990-01-240-4449, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Walker Mfg Co. Government technical data includes 7 specifications, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-240-4449 |
| Primary Part Number | 21838 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Walker Mfg Co |
| Status | ACTIVE |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 8.500 INCHES NOMINAL IN |
| Muffler Design | STRAIGHT THROUGH |
| Body Shape | ROUND |
| Surface Treatment | ZINC |
| 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 |
| Part Number | Manufacturer |
|---|---|
| 25181849 | Volvo Group Government Sales Oceani Oceania Volvo Group Government Sales (AUS) |
| 2ME336B | Cmv Truck and Bus Pty Ltd (AUS) |
| 21838 PRIMARY | Walker Mfg Co (USA) |
| Reference | Meaning |
|---|---|
| 2ME336B | 5/2 Secondary reference U.S. Government activity |
NSN 2990-01-240-4449 is a Muffler,exhaust, manufactured by Walker Mfg Co, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-240-4449 has 3 manufacturer part numbers on file: 25181849 (Volvo Group Government Sales Oceani Oceania Volvo Group Government Sales), 2ME336B (Cmv Truck and Bus Pty Ltd), 21838 (Walker Mfg Co).
Key specifications for 21838: Coolant Type: AIR; Design Type: DRY; Overall Diameter: 8.500 INCHES NOMINAL IN; Overall Length: 40.000 INCHES NOMINAL IN. 7 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.