The Valve,check, cataloged under National Stock Number 4820-01-352-1755, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Kidde-Fenwal, Llc. Government technical data includes 3 specifications, cited from the U.S. Government catalog. The record lists 4 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4820-01-352-1755 |
| Primary Part Number | 877781 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Kidde-Fenwal, Llc |
| Status | ACTIVE |
| Nominal Pipe Size Accommodated | 1.500 INCHES ALL ENDS IN |
| Criticality Code Justification | FEAT |
| Material | STEEL CORROSION RESISTING OVERALL |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | Y |
| Part Number | Manufacturer |
|---|---|
| 877781 PRIMARY | Kidde-Fenwal, Llc (USA) |
| L-673744-SHT4-ITEM 6VM | Naval Inventory Control Point Mechanicsburg (USA) |
| 877781VM | Naval Inventory Control Point Mechanicsburg (USA) |
| 86-877781-000 | Kidde-Fenwal, Llc (USA) |
| Reference | Meaning |
|---|---|
| L-673744-SHT4-ITEM 6 | 5/1 Secondary reference Kidde-Fenwal, Llc |
| 86-877781-000VM | C/1 Advisory reference — outside the item-of-supply concept Naval Inventory Control Point Mechanicsburg |
NSN 4820-01-352-1755 is a Valve,check, manufactured by Kidde-Fenwal, Llc, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-352-1755 has 4 manufacturer part numbers on file: 877781 (Kidde-Fenwal, Llc), L-673744-SHT4-ITEM 6VM (Naval Inventory Control Point Mechanicsburg), 877781VM (Naval Inventory Control Point Mechanicsburg), 86-877781-000 (Kidde-Fenwal, Llc).
Key specifications for 877781: Nominal Pipe Size Accommodated: 1.500 INCHES ALL ENDS IN; Criticality Code Justification: FEAT; Special Features: MAGNETIC PERMEABILITY SHALL NOT EXCEED 2.0 AFTER FABRICATION; Material: STEEL CORROSION RESISTING OVERALL. 3 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.