The Muffler,exhaust, cataloged under National Stock Number 2990-00-101-4920, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Caterpillar Inc Div Caterpillar Defense. Government technical data includes 15 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-101-4920 |
| Primary Part Number | 5L8225 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Caterpillar Inc Div Caterpillar Defense |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Outlet Thread Size | 6-8 FIRST OUTLET |
| Inlet Location | LOCATED CENTER OF END OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 18.500 INCHES NOMINAL IN |
| Inlet Thread Location | INTERNAL SINGLE INLET |
| Outlet Thread Series Designator | NPT FIRST OUTLET |
| Thread Location | INTERNAL FIRST OUTLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Inlet Thread Size | 6-8 SINGLE INLET |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Surface Treatment | PAINT |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Location | LOCATED CENTER OF END OF BODY |
| 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 |
|---|---|
| 5L8225 PRIMARY | Caterpillar Inc Div Caterpillar Defense (USA) |
NSN 2990-00-101-4920 is a Muffler,exhaust, manufactured by Caterpillar Inc Div Caterpillar Defense, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-101-4920 has 1 manufacturer part number on file: 5L8225 (Caterpillar Inc Div Caterpillar Defense).
Key specifications for 5L8225: Operating Position: HORIZONTAL; Outlet Thread Size: 6-8 FIRST OUTLET; Inlet Location: LOCATED CENTER OF END OF BODY; Coolant Type: AIR. 15 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.