The Valve,air Brake Delivery, cataloged under National Stock Number 4820-01-021-4144, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems. 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. 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 | 4820-01-021-4144 |
| Primary Part Number | 280375 |
| Item Name | Valve,air Brake Delivery |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems |
| Status | ACTIVE |
| General Characteristics Item Description | ZINC ALLOY; BRAKE IS CONTROLLED BY AIR COMING INTO SERVICE PORT OPERATING A PISTON W/INTEGRAL SEAT,THIS OPENS THE 2 DELIVERY PORTS TO BRAKES,ON RELEASE OF PRESSURE ON SERVICE SIDE THE VALVE DUMPS THE PRESSURE ON THE BRAKES; VALVE HAS 2 THD PORTS,3/8 IN. 18 NPT-RH THD AND 1 SERVICE PORT 1/4 IN. 18 NPT-RH THD,1 SUPPLY PORT 1/2 IN. 14 NPT-RH THD; FLANGE MTG,2 BOLT HOLES,0.415 IN. DIA,2.500 IN. BETWEEN BOLT HOLE CENTERS 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 |
|---|---|
| 280375 PRIMARY | Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems (USA) |
NSN 4820-01-021-4144 is a Valve,air Brake Delivery, manufactured by Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-021-4144 has 1 manufacturer part number on file: 280375 (Bendix Commercial Vehicle Systems Llc Dba Bendix Commercial Vehicle Systems).
1 possible match (shared part number, not a government interchangeability claim): 2540-01-421-8753. Verify interchangeability with system specifications before substitution.
Key specifications for 280375: General Characteristics Item Description: ZINC ALLOY; BRAKE IS CONTROLLED BY AIR COMING INTO SERVICE PORT OPERATING A PISTON W/INTEGRAL SEAT,THIS OPENS THE 2 DELIVERY PORTS TO BRAKES,ON RELEASE OF PRESSURE ON SERVICE SIDE THE VALVE DUMPS THE PRESSURE ON THE BRAKES; VALVE HAS 2 THD PORTS,3/8 IN. 18 NPT-RH THD AND 1 SERVICE PORT 1/4 IN. 18 NPT-RH THD,1 SUPPLY PORT 1/2 IN. 14 NPT-RH THD; FLANGE MTG,2 BOLT HOLES,0.415 IN. DIA,2.500 IN. BETWEEN BOLT HOLE CENTERS 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.