The Piston,valve, cataloged under National Stock Number 4820-01-426-4888, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Gadren Machine Co Inc Dba Gade Float Valves. Government technical data includes 5 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-426-4888 |
| Primary Part Number | VR-300 ITEM 1 |
| Item Name | Piston,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Gadren Machine Co Inc Dba Gade Float Valves |
| Status | ACTIVE |
| Valve Type for Which Designed | RELIEF |
| Valve Model Number for Which Designed | VR-300 |
| Features Provided | SPRING LOADED |
| Valve Size for Which Designed | 3.000 INCHES IN |
| Valve Design Control Activity | 17181 |
| 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 |
|---|---|
| VR-300 ITEM 1 PRIMARY | Gadren Machine Co Inc Dba Gade Float Valves (USA) |
| Reference | Meaning |
|---|---|
| VR-300 | D/9 Drawing number reference only Gadren Machine Co Inc Dba Gade Float Valves |
| 300-VR ITEM 1 | C/1 Advisory reference — outside the item-of-supply concept Gadren Machine Co Inc Dba Gade Float Valves |
NSN 4820-01-426-4888 is a Piston,valve, manufactured by Gadren Machine Co Inc Dba Gade Float Valves, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-426-4888 has 1 manufacturer part number on file: VR-300 ITEM 1 (Gadren Machine Co Inc Dba Gade Float Valves).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-428-3173. Verify interchangeability with system specifications before substitution.
Key specifications for VR-300 ITEM 1: Valve Type for Which Designed: RELIEF; Valve Model Number for Which Designed: VR-300; Features Provided: SPRING LOADED; Valve Size for Which Designed: 3.000 INCHES IN. 5 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.