The Valve,check, cataloged under National Stock Number 4820-01-566-8304, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Hy-Grade Valve, Inc.. The record lists 2 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 2 items share a part number with this NSN in the catalog (possible match — not a government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 | Valve Automation and Control of San Diego Dba Valve Automation & Control of San Diego Div Valve Automation and Controls of (CAGE 0YRW0); Hy-Grade Valve, Inc. (CAGE 00DR5) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-566-8304 |
| Primary Part Number | T01-05G-10FFX |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Hy-Grade Valve, Inc. |
| 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 |
|---|---|
| T01-05G-10FFX | Valve Automation and Control of San Diego Dba Valve Automation & Control of San Diego Div Valve Automation and Controls of (USA) |
| T01-05G-10FFX PRIMARY | Hy-Grade Valve, Inc. (USA) |
| Reference | Meaning |
|---|---|
| GT01-05G-10FFX | D/9 Drawing number reference only Valve Automation and Control of San Diego Dba Valve Automation & Control of San Diego Div Valve Automation and Controls of |
| GT01-05G-10FFX/P/N-T01-05G-10FFX | 5/9 Secondary reference Hy-Grade Valve, Inc. |
NSN 4820-01-566-8304 is a Valve,check, manufactured by Hy-Grade Valve, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-566-8304 has 2 manufacturer part numbers on file: T01-05G-10FFX (Valve Automation and Control of San Diego Dba Valve Automation & Control of San Diego Div Valve Automation and Controls of), T01-05G-10FFX (Hy-Grade Valve, Inc.).
2 possible matches (shared part number, not a government interchangeability claim): 4820-01-566-8309, 4820-01-566-8313. 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.