The Ball,check, cataloged under National Stock Number 4820-01-559-0443, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Derbyshire Machine & Tool Co. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Ball,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (CAGE 0ASY6); Derbyshire Machine & Tool Co (CAGE 71905) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-559-0443 |
| Primary Part Number | BALL.375SS |
| Item Name | Ball,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Derbyshire Machine & Tool 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 |
|---|---|
| M3687-2383 PC NO 15 | Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc (USA) |
| BALL.375SS PRIMARY | Derbyshire Machine & Tool Co (USA) |
| Reference | Meaning |
|---|---|
| M3687-2383 | D/9 Drawing number reference only Derbyshire Machine & Tool Co |
| M3687-2383 PC NO 15 | 5/9 Secondary reference Derbyshire Machine & Tool Co |
NSN 4820-01-559-0443 is a Ball,check, manufactured by Derbyshire Machine & Tool Co, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-559-0443 has 2 manufacturer part numbers on file: M3687-2383 PC NO 15 (Derbyshire Marine Products, Llc Dba Derbyshire Marine Products Llc), BALL.375SS (Derbyshire Machine & Tool Co).
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.