The Pneumatic Muffler,exhaust-Intake, cataloged under National Stock Number 4330-01-248-4291, is classified within Federal Supply Class 4330 (Centrifugals, Separators, and Pressure and Vacuum Filters) of the Pumps and Compressors group. The manufacturer of record is Norgren C a Co. Government technical data includes 14 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through both NSN and commercial part number lookups. 4 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4330-01-248-4291 |
| Primary Part Number | MB004A |
| Item Name | Pneumatic Muffler,exhaust-Intake |
| FSC / FSG | 4330 / 43 — Centrifugals, Separators, and Pressure and Vacuum Filters |
| Manufacturer | Norgren C a Co |
| Status | ACTIVE |
| Operating Position | ANY ACCEPTABLE |
| Inlet Location | CENTRALLY LOCATED IN END SECTION OF BODY |
| Overall Diameter | 1.250 INCHES NOMINAL IN |
| Inlet Connection Quantity | 1 |
| Inlet Thread Location | EXTERNAL LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Projection Length | 0.500 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Muffler Design | STRAIGHT THROUGH |
| Inlet Connection Type | THREADED LOCATION NOT OTHERWISE SPECIFIED |
| Thread Direction | RIGHT-HAND INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 1/2-14 LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Thread Series Designator | NPT LOCATION NOT OTHERWISE SPECIFIED |
| Surface Treatment | ALUMINUM |
| Material | STEEL CORROSION RESISTING AND COPPER ALLOY 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 |
|---|---|
| MB004A PRIMARY | Norgren C a Co (USA) |
| Reference | Meaning |
|---|---|
| 14611600 ITEM 83 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 6096871-001 | C/1 Advisory reference — outside the item-of-supply concept Naval Sea Systems Command |
| 14611600 ITEM 83 | 5/9 Secondary reference Gulf Coast Holdings, Inc Dba Unidynamics |
| 14611600 ITEM 83 | 5/9 Secondary reference U.S. Government activity |
NSN 4330-01-248-4291 is a Pneumatic Muffler,exhaust-Intake, manufactured by Norgren C a Co, classified under FSC 4330, Centrifugals, Separators, and Pressure and Vacuum Filters. Status: active.
NSN 4330-01-248-4291 has 1 manufacturer part number on file: MB004A (Norgren C a Co).
Key specifications for MB004A: Operating Position: ANY ACCEPTABLE; Inlet Location: CENTRALLY LOCATED IN END SECTION OF BODY; Overall Diameter: 1.250 INCHES NOMINAL IN; Inlet Connection Quantity: 1. 14 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.