The Valve,plug, cataloged under National Stock Number 4820-01-522-1664, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Cunico Corporation. Government technical data includes 17 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-522-1664 |
| Primary Part Number | FRP-2 1-1/2IN/CFV-20766-001 |
| Item Name | Valve,plug |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Cunico Corporation |
| Status | ACTIVE |
| Flange Shape | ROUND WITH HOLES ALL ENDS |
| Furnished Items and Quantity | 1 HANDLE |
| Flange Face Design | PLAIN ALL ENDS |
| Bolt Circle Nominal Diameter | 3.937 INCHES ALL ENDS IN |
| Connection Type | FLANGE ALL ENDS |
| Material Document and Classification | ASTM-B61 ASSN STD SINGLE MATERIAL RESPONSE BODY |
| Material Document and Classification | ASTM-B61 ASSN STD SINGLE MATERIAL RESPONSE FLOW CONTROL DEVICE |
| Bolt Hole Nominal Diameter | 0.562 INCHES ALL ENDS IN |
| Flow Style | TWO-WAY TWO PORT 90 DEGREE PLUG TURN |
| Operating Pressure | 150.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Specification/standard Data | 81349 - MIL-V-24509 REV. A GOVERNMENT SPECIFICATION |
| Nominal Outside Diameter | 5.062 INCHES ALL ENDS IN |
| Bolt Hole Quantity | 6 ALL ENDS |
| Material | BRONZE BODY |
| Material | BRONZE FLOW CONTROL DEVICE |
| Valve Operation Method | MANUAL |
| Nominal Thickness | 0.812 INCHES ALL ENDS IN |
| 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 |
|---|---|
| FRP-2 1-1/2IN/CFV-20766-001 PRIMARY | Cunico Corporation (USA) |
| Reference | Meaning |
|---|---|
| DD-4525 | D/9 Drawing number reference only Cunico Corporation |
| CFV-20766-001 | D/9 Drawing number reference only Cunico Corporation |
NSN 4820-01-522-1664 is a Valve,plug, manufactured by Cunico Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-522-1664 has 1 manufacturer part number on file: FRP-2 1-1/2IN/CFV-20766-001 (Cunico Corporation).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-522-1684. Verify interchangeability with system specifications before substitution.
Key specifications for FRP-2 1-1/2IN/CFV-20766-001: Flange Shape: ROUND WITH HOLES ALL ENDS; Furnished Items and Quantity: 1 HANDLE; Flange Face Design: PLAIN ALL ENDS; Bolt Circle Nominal Diameter: 3.937 INCHES ALL ENDS IN. 17 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.