The Valve,check, cataloged under National Stock Number 4820-01-517-5887, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Centro, Inc.. Government technical data includes 8 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-517-5887 |
| Primary Part Number | 8303-1SWS6TF-98 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Centro, Inc. |
| Status | ACTIVE |
| Connection Style | SOCKET (TUBE) ALL ENDS |
| Connection Type | UNTHREADED INTERNAL TUBE ALL ENDS |
| Style Designator | STRAIGHT THRU |
| Nominal Outside Diameter Tube Accommodated | 0.500 INCHES ALL ENDS IN |
| Disk Loading Method | SPRING |
| Material | STEEL COMP 316 BODY |
| Opening Pressure Setting | 1.0 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 |
|---|---|
| 8303-1SWS6TF-98 PRIMARY | Centro, Inc. (USA) |
| Reference | Meaning |
|---|---|
| 161K0103 ITEM 6 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 161K0103 ITEM 6 | 5/9 Secondary reference Drs Environmental Systems Inc |
| 161K0249 | 7/9 Vendor item drawing reference U.S. Government activity |
| 161K0249 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 161K0103 ITEM 6 | 5/9 Secondary reference U.S. Government activity |
| 161K0249 | 5/9 Secondary reference Drs Environmental Systems Inc |
NSN 4820-01-517-5887 is a Valve,check, manufactured by Centro, Inc., classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-517-5887 has 1 manufacturer part number on file: 8303-1SWS6TF-98 (Centro, Inc.).
Key specifications for 8303-1SWS6TF-98: Connection Style: SOCKET (TUBE) ALL ENDS; Connection Type: UNTHREADED INTERNAL TUBE ALL ENDS; Style Designator: STRAIGHT THRU; Nominal Outside Diameter Tube Accommodated: 0.500 INCHES ALL ENDS IN. 8 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.