The Valve,check, cataloged under National Stock Number 4820-01-475-6112, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Lockheed Martin Aeronautical Systems Support Company Dba Lmassc. The record lists 1 manufacturer part number 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-475-6112 |
| Primary Part Number | 3D3555-01 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Lockheed Martin Aeronautical Systems Support Company Dba Lmassc |
| Status | ACTIVE |
| 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 |
|---|---|
| 3D3555-01 PRIMARY | Lockheed Martin Aeronautical Systems Support Company Dba Lmassc (USA) |
| Reference | Meaning |
|---|---|
| 3D3555-01 | 5/9 Secondary reference Lockheed Martin Services, Llc |
NSN 4820-01-475-6112 is a Valve,check, manufactured by Lockheed Martin Aeronautical Systems Support Company Dba Lmassc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-475-6112 has 1 manufacturer part number on file: 3D3555-01 (Lockheed Martin Aeronautical Systems Support Company Dba Lmassc).
1 possible match (shared part number, not a government interchangeability claim): 4820-01-483-3151. Verify interchangeability with system specifications before substitution.
Key specifications for 3D3555-01: Part Name Assigned by Controlling Agency: CHECK VALVE, DEICER; End Item Identification: C-130J AIRCRAFT. 0 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.