The Valve,check, cataloged under National Stock Number 4820-01-358-0634, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Admiral Filter Company Llc. Government technical data includes 4 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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 | 4820-01-358-0634 |
| Primary Part Number | 204137-1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Admiral Filter Company Llc |
| Status | ACTIVE |
| Style Designator | STRAIGHT THRU |
| Media for Which Designed | FUEL/OIL, HYDROCARBON SINGLE RESPONSE |
| 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 |
|---|---|
| 690220C ITEM 29 | Admiral Filter Company Llc (USA) |
| 204137-1 PRIMARY | Admiral Filter Company Llc (USA) |
| Reference | Meaning |
|---|---|
| 203863 | C/1 Advisory reference — outside the item-of-supply concept Admiral Filter Company Llc |
NSN 4820-01-358-0634 is a Valve,check, manufactured by Admiral Filter Company Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-358-0634 has 2 manufacturer part numbers on file: 690220C ITEM 29 (Admiral Filter Company Llc), 204137-1 (Admiral Filter Company Llc).
1 possible match (shared part number, not a government interchangeability claim): 5340-01-549-2553. Verify interchangeability with system specifications before substitution.
Key specifications for 204137-1: Style Designator: STRAIGHT THRU; Special Features: 0.250 IN. OD TUBE END CONNECTIONS IN; Media for Which Designed: FUEL/OIL, HYDROCARBON SINGLE RESPONSE; Material: STEEL CORROSION RESISTING BODY. 4 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.