The Valve,check, cataloged under National Stock Number 4820-01-344-5603, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Sun Hydraulics Corporation. The record lists 3 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. Current acquisition status: Active.
| Item Name | Valve,check |
| FSC / FSG | 4820 — Valves, Nonpowered (FSG 48) |
| Manufacturers | Branch Hydrauluc Systems Ltd (CAGE U5468); Oshkosh Defense Llc (CAGE 75Q65); Sun Hydraulics Corporation (CAGE 54035) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-344-5603 |
| Primary Part Number | CKCB-XEN |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Sun Hydraulics Corporation |
| 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 |
|---|---|
| CKCB XEN | Branch Hydrauluc Systems Ltd (GBR) |
| 2GL689 | Oshkosh Defense Llc (USA) |
| CKCB-XEN PRIMARY | Sun Hydraulics Corporation (USA) |
| Reference | Meaning |
|---|---|
| A12454 ITEM 20 | 5/9 Secondary reference Twiflex Ltd |
| A12454/20 | 5/9 Secondary reference Twiflex Ltd |
| 7500399 | 5/9 Secondary reference Twiflex Ltd |
| 7500399 | 5/9 Secondary reference Twiflex Ltd |
| A12454 ITEM 20 | 5/9 Secondary reference Twiflex Ltd |
| 2GL689 | 5/9 Secondary reference Oshkosh Corp |
| A12454/20 | 5/9 Secondary reference Twiflex Ltd |
NSN 4820-01-344-5603 is a Valve,check, manufactured by Sun Hydraulics Corporation, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-344-5603 has 3 manufacturer part numbers on file: CKCB XEN (Branch Hydrauluc Systems Ltd), 2GL689 (Oshkosh Defense Llc), CKCB-XEN (Sun Hydraulics Corporation).
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.