The Breather, cataloged under National Stock Number 4310-01-425-0331, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-01-425-0331 |
| Item Name | Breather |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Status | ACTIVE |
| Outside Diameter | 0.750 INCHES NOMINAL IN |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | X |
| Reference | Meaning |
|---|---|
| AD20041 | 3/2 Design control — primary reference U.S. Government activity |
| 05Y19 | 5/9 Secondary reference L-Tec Welding and Cutting Systems |
NSN 4310-01-425-0331 is a Breather, classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
Key specifications for 4310-01-425-0331: Outside Diameter: 0.750 INCHES NOMINAL IN; Overall Length: 1.500 INCHES NOMINAL IN; Special Features: ITEM IS THE BREATHER IN THE PILOT REGULATOR VALVE ASSEMBLY OF A COMPRESSOR;C/O A CYLINDRICAL,EXTERNALLY THREADED,HEX HEAD BODY WITH THREE REMOVABLE FILTER SCREENS UNDER A REMOVABLE PERFORATED DISC TOP; Part Name Assigned by Controlling Agency: SCREEN ASSEMBLY. 1 specification is 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.