The Valve,check, cataloged under National Stock Number 4820-01-421-8097, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Lake Shore Systems, Inc.. Government technical data includes 5 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 5 items share a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-421-8097 |
| Primary Part Number | 2B2-05651 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Lake Shore Systems, Inc. |
| Status | ACTIVE |
| Mounting Position | HORIZONTAL OR VERTICAL |
| Connection Type | UNTHREADED INTERNAL PIPE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Material | STEEL CORROSION RESISTING BODY |
| 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 |
|---|---|
| 2B2-05651 PRIMARY | Lake Shore Systems, Inc. (USA) |
| 2D3-03807-24 | Lake Shore Systems, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 2D3-03807 | D/9 Drawing number reference only Lake Shore Systems, Inc. |
NSN 4820-01-421-8097 is a Valve,check, manufactured by Lake Shore Systems, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-421-8097 has 2 manufacturer part numbers on file: 2B2-05651 (Lake Shore Systems, Inc.), 2D3-03807-24 (Lake Shore Systems, Inc.).
5 possible matches (shared part number, not a government interchangeability claim): 3910-01-421-8467, 3910-01-422-4016, 2090-01-444-2956. Verify interchangeability with system specifications before substitution.
Key specifications for 2B2-05651: Mounting Position: HORIZONTAL OR VERTICAL; Connection Type: UNTHREADED INTERNAL PIPE ALL ENDS; Style Designator: STRAIGHT THRU; End Item Identification: SEAWOLF CLASS SSN. 5 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.