The Valve,check, cataloged under National Stock Number 4820-01-721-9463, is classified within Federal Supply Class 4820 (Valves, Nonpowered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. The record lists 5 manufacturer part numbers for this item, enabling identification through both NSN and commercial part number lookups. 5 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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 | Naval Inventory Control Point Mechanicsburg (CAGE 03950) |
| Parameter | Value |
|---|---|
| NSN | 4820-01-721-9463 |
| Primary Part Number | 845-8616935 ASSY-IRHL1 |
| Item Name | Valve,check |
| FSC / FSG | 4820 / 48 — Valves, Nonpowered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL A — No Demilitarization Required |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 845-8616935 ASSY-IRHL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| LOA028715-RTD-123L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 2644-253-01 ASSY-IRHL1 | Naval Inventory Control Point Mechanicsburg (USA) |
| RTD-123L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| 564-8842606-RTD-123L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| 2644-253-01 ASSY-IRH | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| LOA028715-RTD-123 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| RTD-123 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 564-8842606-RTD-123 | 5/1 Secondary reference Naval Sea Systems Command |
| 845-8616935 ASSY-IRH | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4820-01-721-9463 is a Valve,check, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4820, Valves, Nonpowered. Status: active.
NSN 4820-01-721-9463 has 5 manufacturer part numbers on file: 845-8616935 ASSY-IRHL1 (Naval Inventory Control Point Mechanicsburg), LOA028715-RTD-123L1 (Naval Inventory Control Point Mechanicsburg), 2644-253-01 ASSY-IRHL1 (Naval Inventory Control Point Mechanicsburg), RTD-123L1 (Naval Inventory Control Point Mechanicsburg), 564-8842606-RTD-123L1 (Naval Inventory Control Point Mechanicsburg).
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.