The Pneumatic Muffler,exhaust-Intake, cataloged under National Stock Number 4730-01-558-0978, is classified within Federal Supply Class 4730 (Hose, Pipe, Tube, Lubrication, and Railing Fittings) of the Pipe, Tubing, Hose, and Fittings group. The manufacturer of record is A a a Products Co. Government technical data includes 6 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4730-01-558-0978 |
| Primary Part Number | BM6 |
| Item Name | Pneumatic Muffler,exhaust-Intake |
| FSC / FSG | 4730 / 47 — Hose, Pipe, Tube, Lubrication, and Railing Fittings |
| Manufacturer | A a a Products Co |
| Status | ACTIVE |
| Coolant Type | AIR |
| Design Type | DRY |
| Inlet Connection Quantity | 1 |
| Muffler Design | STRAIGHT THROUGH |
| Body Shape | TAPERED |
| Material | 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 |
|---|---|
| BM6 PRIMARY | A a a Products Co (USA) |
| Reference | Meaning |
|---|---|
| 1600137-24 | 5/2 Secondary reference U.S. Government activity |
NSN 4730-01-558-0978 is a Pneumatic Muffler,exhaust-Intake, manufactured by A a a Products Co, classified under FSC 4730, Hose, Pipe, Tube, Lubrication, and Railing Fittings. Status: active.
NSN 4730-01-558-0978 has 1 manufacturer part number on file: BM6 (A a a Products Co).
1 possible match (shared part number, not a government interchangeability claim): 4730-01-694-9228. Verify interchangeability with system specifications before substitution.
Key specifications for BM6: Coolant Type: AIR; Design Type: DRY; Inlet Connection Quantity: 1; Muffler Design: STRAIGHT THROUGH. 6 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.