The Retainer,disk,valve, cataloged under National Stock Number 4820-01-517-9858, 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through both NSN and commercial part number lookups. 3 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (CAGE 0ASY6) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-517-9858 |
| Primary Part Number | M3683A-5-AT |
| Item Name | Retainer,disk,valve |
| 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 |
|---|---|
| M3894-2609 PC NO 2 | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| M3683A-5-AT PRIMARY | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| Reference | Meaning |
|---|---|
| M3894-2609 | D/9 Drawing number reference only Derbyshire Machine & Tool Co |
| M3683A-5-AT | 3/9 Design control — primary reference Derbyshire Machine & Tool Co |
| M3894-2609 PC NO 2 | 5/9 Secondary reference Derbyshire Machine & Tool Co |
NSN 4820-01-517-9858 is a Retainer,disk,valve, manufactured by Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-517-9858 has 2 manufacturer part numbers on file: M3894-2609 PC NO 2 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc), M3683A-5-AT (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-517-9868, 3120-01-518-6451. Verify interchangeability with system specifications before substitution.
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.