The Retainer,disk,valve, cataloged under National Stock Number 4820-01-535-9666, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4820-01-535-9666 |
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | QUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE,CLEANED IAW MIL-C-52211 |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Reference | Meaning |
|---|---|
| V3E10073-5 | 5/1 Secondary reference U.S. Government activity |
| V2C13058-3EAC1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| V3E10079-5C1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| V3E10074-5 | 5/1 Secondary reference U.S. Government activity |
| V2C13058-3EA | 3/1 Design control — primary reference U.S. Government activity |
| V3E10074-5C1 | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-535-9666 is a Retainer,disk,valve, classified under FSC 4820, Valves, Nonpowered. Status: active.
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-536-1495, 4820-01-536-1545. Verify interchangeability with system specifications before substitution.
Key specifications for 4820-01-535-9666: Criticality Code Justification: ZZZY; End Item Identification: MANIFOLD,RED .25 NPS; Reference Number Differentiating Characteristics: QUALITY CONTROLLED IAW NAVY LEVEL 1 ASSURANCE GUIDE,CLEANED IAW MIL-C-52211. 2 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.