The Muffler,exhaust-Intake, cataloged under National Stock Number 2990-01-515-3786, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Naval Sea Systems Command. The record lists 3 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.
| Item Name | Muffler,exhaust-Intake |
| FSC / FSG | 2990 — Miscellaneous Engine Accessories, Nonaircraft (FSG 29) |
| Manufacturers | Huntington Ingalls Inc Div Newport News Shipbuilding (CAGE 43689); Naval Sea Systems Command (CAGE 53711) |
| Parameter | Value |
|---|---|
| NSN | 2990-01-515-3786 |
| Primary Part Number | 554-6404696 ASSY 99 |
| Item Name | Muffler,exhaust-Intake |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL B — Remove Demilitarization Key Points |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Part Number | Manufacturer |
|---|---|
| DF2740-2303 ASSY 99 | Huntington Ingalls Inc Div Newport News Shipbuilding (USA) |
| 551-7068105-F2 | Naval Sea Systems Command (USA) |
| 554-6404696 ASSY 99 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| H765-1202-F2 | 5/2 Secondary reference U.S. Government activity |
| 6404696 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 2990-01-515-3786 is a Muffler,exhaust-Intake, manufactured by Naval Sea Systems Command, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-515-3786 has 3 manufacturer part numbers on file: DF2740-2303 ASSY 99 (Huntington Ingalls Inc Div Newport News Shipbuilding), 551-7068105-F2 (Naval Sea Systems Command), 554-6404696 ASSY 99 (Naval Sea Systems Command).
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
NSN 2990-01-515-3786 has DEMIL Code B. Demilitarization may be required before disposal or transfer to non-military entities.
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.