The Valve Assembly,manifold, cataloged under National Stock Number 4820-01-418-6563, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Sea Systems Command. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 2 manufacturer part numbers 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-418-6563 |
| Primary Part Number | 551-6685223-AY99 |
| Item Name | Valve Assembly,manifold |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Sea Systems Command |
| Status | ACTIVE |
| Valve Quantity | 5 |
| Connection Type | THREADED EXTERNAL BOSS |
| End Connection Quantity | 5 |
| Nominal Thread Size | 0.750 INCHES AND 0.438 INCHES IN |
| Body Material | STEEL COMP 304 |
| Thread Class | 2B |
| Thread Series Designator | UNF |
| Valve Operation Method | AUTOMATIC |
| 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 |
|---|---|
| 551-6685220-24 | Naval Sea Systems Command (USA) |
| 551-6685223-AY99 PRIMARY | Naval Sea Systems Command (USA) |
| Reference | Meaning |
|---|---|
| 6685223 | D/9 Drawing number reference only Naval Sea Systems Command |
NSN 4820-01-418-6563 is a Valve Assembly,manifold, manufactured by Naval Sea Systems Command, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-418-6563 has 2 manufacturer part numbers on file: 551-6685220-24 (Naval Sea Systems Command), 551-6685223-AY99 (Naval Sea Systems Command).
Key specifications for 551-6685223-AY99: Valve Quantity: 5; Connection Type: THREADED EXTERNAL BOSS; End Connection Quantity: 5; Nominal Thread Size: 0.750 INCHES AND 0.438 INCHES IN. 8 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.