The Valve,check, cataloged under National Stock Number 4820-01-710-5529, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is International Valve Corp Dba Check-All Valve Mfg. Co.. 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through both NSN and commercial part number lookups. 1 additional reference document (drawings, advisory and superseded references) is recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Item Name | Valve,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | International Valve Corp Dba Check-All Valve Mfg. Co. (CAGE 28396) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-710-5529 |
| Primary Part Number | B4LCSBN5.OOSSXX |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | International Valve Corp Dba Check-All Valve Mfg. Co. |
| 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 |
|---|---|
| B4LCSBN5.OOSSXX PRIMARY | International Valve Corp Dba Check-All Valve Mfg. Co. (USA) |
| P-3-6-21 | International Valve Corp Dba Check-All Valve Mfg. Co. (USA) |
| Reference | Meaning |
|---|---|
| 112159137 | D/9 Drawing number reference only Bird-Johnson Propeller Company, Llc |
NSN 4820-01-710-5529 is a Valve,check, manufactured by International Valve Corp Dba Check-All Valve Mfg. Co., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-710-5529 has 2 manufacturer part numbers on file: B4LCSBN5.OOSSXX (International Valve Corp Dba Check-All Valve Mfg. Co.), P-3-6-21 (International Valve Corp Dba Check-All Valve Mfg. Co.).
1 possible match (shared part number, not a government interchangeability claim): 4720-01-710-5932. 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.