The Vent Drain Assembly, cataloged under National Stock Number 4820-01-085-2559, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | 4820-01-085-2559 |
| Primary Part Number | 2621-827-05 ASSY6 |
| Item Name | Vent Drain Assembly |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool Co |
| Status | ACTIVE |
| General Characteristics Item Description | BRONZE BODY,STRAIGHT THRU FLOW,BOTH END CONNECTIONS 0.500 IN. UNTHD INTERNAL PIPE.SOCKET TYPE W/BRAZING RING GROOVE,MANUALLY OPERATED VENT VALVE STEM,500.0 PSI WORKING PRESSURE,1.915 IN. LG,2.562 IN. 0/A H 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 |
|---|---|
| 2621-827-05 ASSY6 PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| 2621-827-05ASSY6 | 3/2 Design control — primary reference U.S. Government activity |
| 262182705-006 | 5/2 Secondary reference U.S. Government activity |
NSN 4820-01-085-2559 is a Vent Drain Assembly, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-085-2559 has 1 manufacturer part number on file: 2621-827-05 ASSY6 (Derbyshire Machine & Tool Co).
Key specifications for 2621-827-05 ASSY6: General Characteristics Item Description: BRONZE BODY,STRAIGHT THRU FLOW,BOTH END CONNECTIONS 0.500 IN. UNTHD INTERNAL PIPE.SOCKET TYPE W/BRAZING RING GROOVE,MANUALLY OPERATED VENT VALVE STEM,500.0 PSI WORKING PRESSURE,1.915 IN. LG,2.562 IN. 0/A H IN. 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.