The Muffler,exhaust, cataloged under National Stock Number 2990-01-031-7117, 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 14 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-031-7117 |
| Primary Part Number | 21874-42476-21873-44551 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Walker Mfg Co |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Location | OFFSET IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 6.000 INCHES NOMINAL IN |
| Muffler Design | BAFFLE |
| Outlet Outside Diameter | 2.000 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Surface Treatment | ALUMINUM ALLOY |
| Inlet Inside Diameter | 2.000 INCHES NOMINAL SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | CENTRALLY LOCATED IN END SECTION 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 |
|---|---|
| 21874 | Walker Mfg Co (USA) |
| 343200 | General Motors Llc Dba General Motors Llc (USA) |
| 21874-42476-21873-44551 PRIMARY | Walker Mfg Co (USA) |
| Reference | Meaning |
|---|---|
| D5DZ5230-E | 5/9 Secondary reference Ford Motor Company |
| D5DZ5230-E | 5/9 Secondary reference Ford Motor Co Ford Parts and Service Div Government Part Sales |
| 343200 | 5/9 Secondary reference General Motors Corp Chevrolet Motor Div Special Products Dept |
NSN 2990-01-031-7117 is a Muffler,exhaust, manufactured by Walker Mfg Co, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-031-7117 has 3 manufacturer part numbers on file: 21874 (Walker Mfg Co), 343200 (General Motors Llc Dba General Motors Llc), 21874-42476-21873-44551 (Walker Mfg Co).
1 possible match (shared part number, not a government interchangeability claim): 5930-01-326-6809. Verify interchangeability with system specifications before substitution.
Key specifications for 21874-42476-21873-44551: Operating Position: HORIZONTAL; Inlet Location: OFFSET IN END SECTION OF BODY; Coolant Type: AIR; Design Type: DRY. 14 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.