The Valve,check, cataloged under National Stock Number 4820-01-542-1981, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division. Government technical data includes 5 specifications, cited from the U.S. Government catalog. The record lists 6 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-542-1981 |
| Primary Part Number | 8L-C8L-1-T-SS |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division |
| Status | ACTIVE |
| Operating Pressure | 4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS |
| Maximum Operating Temp | 400.0 FAHRENHEIT SINGLE RESPONSE DEGF |
| Material | STEEL CORROSION RESISTING BODY |
| Opening Pressure Setting | 5.0 POUNDS PER SQUARE INCH LBS |
| 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 |
|---|---|
| 799-D-13343 REV D ITEM 27 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| 8L-C8L-1-T-SS PRIMARY | Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division (USA) |
| 799-D-13342 REV C ITEM 30 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| 940-09119-000 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| 799-D-13343 REV D FN 41 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
| 799-D-13342 REV C ITEM 31 | Aqua-Chem, Inc. Dba Aqua-Chem Inc (USA) |
NSN 4820-01-542-1981 is a Valve,check, manufactured by Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-542-1981 has 6 manufacturer part numbers on file: 799-D-13343 REV D ITEM 27 (Aqua-Chem, Inc. Dba Aqua-Chem Inc), 8L-C8L-1-T-SS (Parker-Hannifin Corporation Dba Pneutronics Div Tube Fittings Division), 799-D-13342 REV C ITEM 30 (Aqua-Chem, Inc. Dba Aqua-Chem Inc), 940-09119-000 (Aqua-Chem, Inc. Dba Aqua-Chem Inc), 799-D-13343 REV D FN 41 (Aqua-Chem, Inc. Dba Aqua-Chem Inc) and 1 more.
Key specifications for 8L-C8L-1-T-SS: Operating Pressure: 4000.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM SINGLE RESPONSE LBS; Maximum Operating Temp: 400.0 FAHRENHEIT SINGLE RESPONSE DEGF; Part Name Assigned by Controlling Agency: 1/2 INCH BY 1/2 INCH CHECK VALVE IN; End Item Identification: TYPE - 3K HPRO ASSEMBLY FOR LHD-8. 5 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.