The Retainer,disk,valve, cataloged under National Stock Number 4820-01-641-8525, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. The record lists 7 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-641-8525 |
| Primary Part Number | 7550478-PLC-11402-8D4 |
| Item Name | Retainer,disk,valve |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P-9290 SYSTEM CERTIFICATION PRODURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICLES AS DIFFERENTIATED BY SPECIAL TEST FEATURES |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 7550478-PLC-11402-8D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| PLC-12468 ITEM 8D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| PLC-11402 PC 8D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| G547-0001-PLC-11402-8D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| H547-0001-PLC-11402-8D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 7383858-PLC-11402-8D4 | Naval Inventory Control Point Mechanicsburg (USA) |
| 041373AGD4 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 7550478-PLC-11402-8 | 5/1 Secondary reference Naval Sea Systems Command |
| PLC-12468 ITEM 8 | 5/1 Secondary reference U.S. Government activity |
| H547-0001-PLC-11402-8 | 5/1 Secondary reference U.S. Government activity |
| G547-0001-PLC-11402-8 | 5/1 Secondary reference U.S. Government activity |
| PLC-11402 PC 8 | 3/1 Design control — primary reference U.S. Government activity |
| 041373AG | 5/1 Secondary reference U.S. Government activity |
| 7383858-PLC-11402-8 | 5/1 Secondary reference Naval Sea Systems Command |
NSN 4820-01-641-8525 is a Retainer,disk,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-641-8525 has 7 manufacturer part numbers on file: 7550478-PLC-11402-8D4 (Naval Inventory Control Point Mechanicsburg), PLC-12468 ITEM 8D4 (Naval Inventory Control Point Mechanicsburg), PLC-11402 PC 8D4 (Naval Inventory Control Point Mechanicsburg), G547-0001-PLC-11402-8D4 (Naval Inventory Control Point Mechanicsburg), H547-0001-PLC-11402-8D4 (Naval Inventory Control Point Mechanicsburg) and 2 more.
Key specifications for 7550478-PLC-11402-8D4: Criticality Code Justification: ZZZY; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW SS800-AG-MAN-010/P-9290 SYSTEM CERTIFICATION PRODURES AND CRITERIA MANUAL FOR DEEP SUBMERGENCE SYSTEMS; CRITICAL ITEM FOR SAFETY AND SURVIVAL OF DEEP SUBMERGENCE RESEARCH AND RESCUE VEHICLES AS DIFFERENTIATED BY SPECIAL TEST FEATURES. 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.