The Valve,check, cataloged under National Stock Number 4820-00-939-8991, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hpm Corp. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Valve,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Hpm Corp (CAGE 29975) |
| Parameter | Value |
|---|---|
| NSN | 4820-00-939-8991 |
| Primary Part Number | 3535-3 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hpm Corp |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Part Number | Manufacturer |
|---|---|
| 3535-3 PRIMARY | Hpm Corp (USA) |
| Reference | Meaning |
|---|---|
| 508467-1 | 1/2 Source control — Government-approved source U.S. Government activity |
NSN 4820-00-939-8991 is a Valve,check, manufactured by Hpm Corp, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-00-939-8991 has 1 manufacturer part number on file: 3535-3 (Hpm Corp).
1 possible match (shared part number, not a government interchangeability claim): 5335-01-041-4354. Verify interchangeability with system specifications before substitution.
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.