The Disk,valve, cataloged under National Stock Number 4820-01-398-5719, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-398-5719 |
| Primary Part Number | X1850-5 |
| Item Name | Disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc |
| Status | ACTIVE |
| Outside Diameter | 3.875 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 |
| Part Number | Manufacturer |
|---|---|
| M3255-6 | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| X1850-5 PRIMARY | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| Reference | Meaning |
|---|---|
| M3255 | D/9 Drawing number reference only Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc |
NSN 4820-01-398-5719 is a Disk,valve, manufactured by Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-398-5719 has 2 manufacturer part numbers on file: M3255-6 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc), X1850-5 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-398-8462. Verify interchangeability with system specifications before substitution.
Key specifications for X1850-5: Overall Height: 2.750 INCHES NOMINAL IN; Outside Diameter: 3.875 INCHES NOMINAL 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.