The Pneumatic Muffler,exhaust-Intake, cataloged under National Stock Number 4310-01-372-6665, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Nelson Industries Inc Universal Silencer Div. Government technical data includes 24 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-01-372-6665 |
| Primary Part Number | URB-1 |
| Item Name | Pneumatic Muffler,exhaust-Intake |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Nelson Industries Inc Universal Silencer Div |
| Status | ACTIVE |
| Outlet Thread Size | 1.000-11-1/2 LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Connection Quantity | 1 |
| Inlet Location | CENTRALLY LOCATED ON END SECTION OF BODY |
| Coolant Type | AIR |
| Design Type | JACKETED |
| Overall Diameter | 4.500 INCHES NOMINAL IN |
| Outlet Thread Direction | RIGHT-HAND LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Connection Quantity | 1 |
| Inlet Thread Location | EXTERNAL LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Projection Length | 2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Outlet Thread Series Designator | NPT LOCATION NOT OTHERWISE SPECIFIED |
| Muffler Design | MULTIPASS |
| Thread Location | EXTERNAL FIRST OUTLET |
| Tube Quantity | 3 |
| Inlet Connection Type | THREADED LOCATION NOT OTHERWISE SPECIFIED |
| Thread Direction | RIGHT-HAND INLET |
| Body Shape | ROUND |
| Inlet Thread Size | 1.000-11-1/2 LOCATION NOT OTHERWISE SPECIFIED |
| Inlet Thread Series Designator | NPT LOCATION NOT OTHERWISE SPECIFIED |
| Surface Treatment | PRIMER AND PAINT HEAT RESISTANT |
| Material | STEEL LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Projection Length | 2.000 INCHES NOMINAL LOCATION NOT OTHERWISE SPECIFIED IN |
| Outlet Connection Type | THREADED LOCATION NOT OTHERWISE SPECIFIED |
| Outlet Location | CENTRALLY LOCATED ON END SECTION OF BODY |
| 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 |
|---|---|
| URB-1 PRIMARY | Nelson Industries Inc Universal Silencer Div (USA) |
| Reference | Meaning |
|---|---|
| URB | 5/1 Secondary reference Nelson Industries Inc Universal Silencer Div |
NSN 4310-01-372-6665 is a Pneumatic Muffler,exhaust-Intake, manufactured by Nelson Industries Inc Universal Silencer Div, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-01-372-6665 has 1 manufacturer part number on file: URB-1 (Nelson Industries Inc Universal Silencer Div).
Key specifications for URB-1: Outlet Thread Size: 1.000-11-1/2 LOCATION NOT OTHERWISE SPECIFIED; Outlet Connection Quantity: 1; Inlet Location: CENTRALLY LOCATED ON END SECTION OF BODY; Coolant Type: AIR. 24 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.