The Pneumatic Muffler,exhaust-Intake, cataloged under National Stock Number 4310-01-339-9986, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Air-Vac Engineering Company Inc. Government technical data includes 4 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 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 | 4310-01-339-9986 |
| Primary Part Number | S-143 |
| Item Name | Pneumatic Muffler,exhaust-Intake |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Air-Vac Engineering Company Inc |
| Status | ACTIVE |
| Design Type | JACKETED |
| Inlet Connection Quantity | 1 |
| Inlet Connection Type | THREADED LOCATION NOT OTHERWISE SPECIFIED |
| Body Shape | ROUND |
| 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 |
|---|---|
| S-143 PRIMARY | Air-Vac Engineering Company Inc (USA) |
NSN 4310-01-339-9986 is a Pneumatic Muffler,exhaust-Intake, manufactured by Air-Vac Engineering Company Inc, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-01-339-9986 has 1 manufacturer part number on file: S-143 (Air-Vac Engineering Company Inc).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-670-1850. Verify interchangeability with system specifications before substitution.
Key specifications for S-143: Design Type: JACKETED; Inlet Connection Quantity: 1; Inlet Connection Type: THREADED LOCATION NOT OTHERWISE SPECIFIED; Body Shape: ROUND. 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.