The Muffler,exhaust, cataloged under National Stock Number 2990-00-700-0537, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Cummins Filtration Inc.. Government technical data includes 20 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-00-700-0537 |
| Primary Part Number | T1323B |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Cummins Filtration Inc. |
| Status | ACTIVE |
| Operating Position | HORIZONTAL |
| Inlet Outside Diameter | 2.625 INCHES NOMINAL SINGLE INLET IN |
| Inlet Location | LOCATED IN END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | DRY |
| Overall Diameter | 8.500 INCHES NOMINAL IN |
| Outlet Inside Diameter | 2.505 INCHES MINIMUM AND 2.525 INCHES MAXIMUM FIRST OUTLET IN |
| Inlet Projection Length | 3.313 INCHES NOMINAL SINGLE INLET IN |
| Baffle Quantity | 2 |
| Muffler Design | BAFFLE |
| Outlet Outside Diameter | 2.625 INCHES NOMINAL FIRST OUTLET IN |
| Tube Quantity | 3 |
| Inlet Connection Type | UNTHREADED SINGLE INLET |
| Body Shape | ROUND |
| Surface Treatment | ENAMEL |
| Inlet Inside Diameter | 2.505 INCHES MINIMUM AND 2.525 INCHES MAXIMUM SINGLE INLET IN |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 3.313 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | 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 |
|---|---|
| 7000537 | U S Army Tank Automotive Command Amsta-Im-Mm (USA) |
| T1323B PRIMARY | Cummins Filtration Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2158173 | 5/9 Secondary reference General Motors Corp |
| 2158173 | C/1 Advisory reference — outside the item-of-supply concept General Motors Llc Dba General Motors Llc |
NSN 2990-00-700-0537 is a Muffler,exhaust, manufactured by Cummins Filtration Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-700-0537 has 2 manufacturer part numbers on file: 7000537 (U S Army Tank Automotive Command Amsta-Im-Mm), T1323B (Cummins Filtration Inc.).
Key specifications for T1323B: Operating Position: HORIZONTAL; Inlet Outside Diameter: 2.625 INCHES NOMINAL SINGLE INLET IN; Inlet Location: LOCATED IN END SECTION OF BODY; Coolant Type: AIR. 20 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.