The Valve,safety Relief, cataloged under National Stock Number 4820-01-449-2984, 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. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (CAGE 0ASY6) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-449-2984 |
| Primary Part Number | M3621-2-BA |
| Item Name | Valve,safety Relief |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc |
| Status | ACTIVE |
| 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 |
|---|---|
| M3621-2-BA PRIMARY | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| M3621-2353 PC2 | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| Reference | Meaning |
|---|---|
| M3621-2353 | D/9 Drawing number reference only Derbyshire Machine & Tool Co |
| M3621-2-BA | 3/9 Design control — primary reference Derbyshire Machine & Tool Co |
| M3621-2353 PC2 | 5/9 Secondary reference Derbyshire Machine & Tool Co |
NSN 4820-01-449-2984 is a Valve,safety Relief, manufactured by Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-449-2984 has 2 manufacturer part numbers on file: M3621-2-BA (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc), M3621-2353 PC2 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc).
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.