The Retainer,disk,valve, cataloged under National Stock Number 4820-01-261-5070, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Portland Valve Llc. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-261-5070 |
| Primary Part Number | 2285-304 PIECE 2 |
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Portland Valve Llc |
| Status | ACTIVE |
| Outside Diameter | 13.500 INCHES NOMINAL IN |
| Material Document and Classification | QQ-N-286,CL A FED SPEC SINGLE MATERIAL RESPONSE |
| Inside Diameter | 4.938 INCHES NOMINAL IN |
| Material | NICKEL ALLOY |
| 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 |
|---|---|
| 2285-304 PIECE 2 PRIMARY | Portland Valve Llc (USA) |
| Reference | Meaning |
|---|---|
| 2285-304 PIECE 2 | 5/9 Secondary reference Huntington Ingalls Inc Div Newport News Shipbuilding |
NSN 4820-01-261-5070 is a Retainer,disk,valve, manufactured by Portland Valve Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-261-5070 has 1 manufacturer part number on file: 2285-304 PIECE 2 (Portland Valve Llc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-529-0648. Verify interchangeability with system specifications before substitution.
Key specifications for 2285-304 PIECE 2: Outside Diameter: 13.500 INCHES NOMINAL IN; Material Document and Classification: QQ-N-286,CL A FED SPEC SINGLE MATERIAL RESPONSE; Overall Length: 3.938 INCHES NOMINAL IN; Inside Diameter: 4.938 INCHES NOMINAL IN. 4 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.