The Muffler,exhaust, cataloged under National Stock Number 2990-01-263-9721, is classified within Federal Supply Class 2990 (Miscellaneous Engine Accessories, Nonaircraft) of the Engine Accessories group. The manufacturer of record is Miller Electric Mfg. Llc. Government technical data includes 3 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 2990-01-263-9721 |
| Primary Part Number | 004720 |
| Item Name | Muffler,exhaust |
| FSC / FSG | 2990 / 29 — Miscellaneous Engine Accessories, Nonaircraft |
| Manufacturer | Miller Electric Mfg. Llc |
| Status | ACTIVE |
| Overall Diameter | 6.000 INCHES NOMINAL IN |
| Body Shape | RECTANGULAR |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| 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 |
|---|---|
| 004720 PRIMARY | Miller Electric Mfg. Llc (USA) |
| Reference | Meaning |
|---|---|
| 004720 | 3/9 Design control — primary reference Miller Electric Mfg. Co. |
NSN 2990-01-263-9721 is a Muffler,exhaust, manufactured by Miller Electric Mfg. Llc, classified under FSC 2990, Miscellaneous Engine Accessories, Nonaircraft. Status: active.
NSN 2990-01-263-9721 has 1 manufacturer part number on file: 004720 (Miller Electric Mfg. Llc).
2 possible matches (shared part number, not a government interchangeability claim): 5340-01-543-0257, 5845-01-599-6874. Verify interchangeability with system specifications before substitution.
Key specifications for 004720: Overall Diameter: 6.000 INCHES NOMINAL IN; Overall Length: 12.000 INCHES NOMINAL IN; Body Shape: RECTANGULAR; End Item Identification: USED ON MILLER ELECTRIC BIG 20 WELDING GENERATOR. 3 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.