The Valve,check, cataloged under National Stock Number 4820-01-523-3209, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Howell Laboratories Inc Dba Howell Laboratories Inc. Government technical data includes 1 specification, cited from the U.S. Government catalog. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 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 | 4820-01-523-3209 |
| Primary Part Number | 7335-05 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Howell Laboratories Inc Dba Howell Laboratories Inc |
| Status | ACTIVE |
| Material | PLASTIC VINYL OVERALL |
| 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 |
|---|---|
| 7335-05 PRIMARY | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 7459-ITEM NO 18 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
| 7335B-05 | Howell Laboratories Inc Dba Howell Laboratories Inc (USA) |
NSN 4820-01-523-3209 is a Valve,check, manufactured by Howell Laboratories Inc Dba Howell Laboratories Inc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-523-3209 has 3 manufacturer part numbers on file: 7335-05 (Howell Laboratories Inc Dba Howell Laboratories Inc), 7459-ITEM NO 18 (Howell Laboratories Inc Dba Howell Laboratories Inc), 7335B-05 (Howell Laboratories Inc Dba Howell Laboratories Inc).
1 possible match (shared part number, not a government interchangeability claim): 4810-01-666-3105. Verify interchangeability with system specifications before substitution.
Key specifications for 7335-05: Special Features: INLET AND OUTLET .5 INCH MNPT; BOOST PRESSURE OF 20 PSI; SUCTION PORT ; BUILT IN BACK CHECK VALVE WITH KEL-F SEAT; POLYTETRAFLUOROETHYLENEBALL AND H ASTELLOY-C SPRING, CAP WITH ,25 INCH MNPT AND .25 INCH HOSE BARB. IN; End Item Identification: INJECTOR SYSTEM; Material: PLASTIC VINYL OVERALL. 1 specification is 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.