The Muffler,exhaust, cataloged under National Stock Number 2990-01-620-7057, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Onan Corp Onan Power/electronics Div. Government technical data includes 4 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. 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 | 2990-01-620-7057 |
| Primary Part Number | 155-4661 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Onan Corp Onan Power/electronics Div |
| Status | ACTIVE |
| Operating Position | VERTICAL |
| Coolant Type | WATER |
| Design Type | DRY |
| Body Shape | IRREGULAR |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
NSN 2990-01-620-7057 is a Muffler,exhaust, manufactured by Onan Corp Onan Power/electronics Div, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-620-7057 has 2 manufacturer part numbers on file: 155-4661 (Onan Corporation Dba Onan Indiana), 155-4661 (Onan Corp Onan Power/electronics Div).
1 possible match (shared part number, not a government interchangeability claim): 6515-01-683-3553. Verify interchangeability with system specifications before substitution.
Key specifications for 155-4661: Operating Position: VERTICAL; Coolant Type: WATER; Design Type: DRY; Body Shape: IRREGULAR. 4 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.