The Muffler,exhaust, cataloged under National Stock Number 2990-01-031-9406, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Phillips and Temro Industries Inc E M Products Div. Government technical data includes 16 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-031-9406 |
| Primary Part Number | TDU01-5026 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Phillips and Temro Industries Inc E M Products Div |
| Status | ACTIVE |
| Operating Position | VERTICAL |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Design Type | DRY |
| Overall Diameter | 5.120 INCHES NOMINAL IN |
| Inlet Thread Location | INTERNAL SINGLE INLET |
| Inlet Projection Length | 1.500 INCHES NOMINAL SINGLE INLET IN |
| Outlet Outside Diameter | 1.500 INCHES NOMINAL FIRST OUTLET IN |
| Inlet Connection Type | THREADED SINGLE INLET |
| Thread Direction | RIGHT-HAND SINGLE INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 1.500-11-1/2 SINGLE INLET |
| Inlet Thread Series Designator | NPT SINGLE INLET |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 2.000 INCHES NOMINAL FIRST OUTLET IN |
| Outlet Connection Type | UNTHREADED FIRST OUTLET |
| Outlet Location | CENTRALLY LOCATED IN END SECTION OPPOSITE INLET |
| 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 |
|---|---|
| TDU01-5026 PRIMARY | Phillips and Temro Industries Inc E M Products Div (USA) |
| Reference | Meaning |
|---|---|
| TDU01-5026 | 5/9 Secondary reference Reliable Industries Inc of New Orleans |
| TDU01-5026 | 5/9 Secondary reference U.S. Government activity |
| TDU01-5026 | 5/9 Secondary reference Electro-Motion, Inc. |
NSN 2990-01-031-9406 is a Muffler,exhaust, manufactured by Phillips and Temro Industries Inc E M Products Div, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-031-9406 has 1 manufacturer part number on file: TDU01-5026 (Phillips and Temro Industries Inc E M Products Div).
Key specifications for TDU01-5026: Operating Position: VERTICAL; Inlet Location: CENTRALLY LOCATED IN END SECTION OF BODY; Design Type: DRY; Overall Diameter: 5.120 INCHES NOMINAL IN. 16 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.