The Breather, cataloged under National Stock Number 4310-01-252-7920, is classified within Federal Supply Class 4310 (Compressors and Vacuum Pumps) of the Pumps and Compressors group. The manufacturer of record is Leybold Usa Inc.. Government technical data includes 1 specification, 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4310-01-252-7920 |
| Primary Part Number | 99-171-126 |
| Item Name | Breather |
| FSC / FSG | 4310 / 43 — Compressors and Vacuum Pumps |
| Manufacturer | Leybold Usa Inc. |
| Status | ACTIVE |
| Outside Diameter | 5.000 INCHES MAXIMUM IN |
| 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 |
|---|---|
| 99-171-126 PRIMARY | Leybold Usa Inc. (USA) |
| Reference | Meaning |
|---|---|
| 000-8006-295 | 5/9 Secondary reference U.S. Government activity |
| 99-171-126 | 3/9 Design control — primary reference Leybold Vacuum Products Inc |
NSN 4310-01-252-7920 is a Breather, manufactured by Leybold Usa Inc., classified under FSC 4310, Compressors and Vacuum Pumps. Status: active.
NSN 4310-01-252-7920 has 1 manufacturer part number on file: 99-171-126 (Leybold Usa Inc.).
Key specifications for 99-171-126: Overall Height: 8.000 INCHES MAXIMUM IN; Outside Diameter: 5.000 INCHES MAXIMUM IN; End Item Identification: LEYBOLD-HERAEUS MODELS D8,D16,S8,S16,D8AC AND D16AC PUMPS. 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.