The Muffler,exhaust, cataloged under National Stock Number 2990-00-336-9934, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Hatch & Kirk, Inc.. The record lists 4 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 — Miscellaneous Engine Accessories, Nonaircraft (FSG 29) |
| Manufacturers | Hatch & Kirk, Inc. (CAGE 55380); Naval Sea Systems Command (CAGE 53711) |
| Parameter | Value |
|---|---|
| NSN | 2990-00-336-9934 |
| Primary Part Number | 3307649 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Hatch & Kirk, Inc. |
| Status | ACTIVE |
| 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 |
|---|---|
| 3307649 PRIMARY | Hatch & Kirk, Inc. (USA) |
| 81125S41-35781ALT3PCB | Naval Sea Systems Command (USA) |
| 81125S41-34480ALT1PCB | Naval Sea Systems Command (USA) |
| 3304445 PRIMARY | Hatch & Kirk, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 81125S41-34480ALT1PCB | 5/9 Secondary reference U.S. Government activity |
| 3307649 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 3304445 | 5/9 Secondary reference General Motors Corp Electro-Motive Div |
| 228 | D/9 Drawing number reference only U.S. Government activity |
| 26ABX1933B | 5/9 Secondary reference Engineering Specialties Co |
| 81125S41-35781ALT3PCB | 5/9 Secondary reference U.S. Government activity |
| 514SAM228B | 3/2 Design control — primary reference U.S. Government activity |
NSN 2990-00-336-9934 is a Muffler,exhaust, manufactured by Hatch & Kirk, Inc., classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-00-336-9934 has 4 manufacturer part numbers on file: 3307649 (Hatch & Kirk, Inc.), 81125S41-35781ALT3PCB (Naval Sea Systems Command), 81125S41-34480ALT1PCB (Naval Sea Systems Command), 3304445 (Hatch & Kirk, Inc.).
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.