The Piston,valve, cataloged under National Stock Number 4810-01-544-9170, is classified within Federal Supply Class 4810 (Valves, Powered) of the Valves group. The manufacturer of record is Naval Inventory Control Point Mechanicsburg. Government technical data includes 2 specifications, cited from the U.S. Government catalog. 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through both NSN and commercial part number lookups. 2 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog.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.
| Parameter | Value |
|---|---|
| NSN | 4810-01-544-9170 |
| Primary Part Number | 566-6985426-25L1 |
| Item Name | Piston,valve |
| FSC / FSG | 4810 / 48 — Valves, Powered |
| Manufacturer | Naval Inventory Control Point Mechanicsburg |
| Status | ACTIVE |
| Criticality Code Justification | ZZZY |
| Reference Number Differentiating Characteristics | MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS |
| Acquisition Status | ACTIVE |
| DEMIL Code | DEMIL Q — CCL Item — Commerce Control List |
| Hazard | No hazard code in the DLA record (HMIC N) |
| Criticality Code | S |
| Part Number | Manufacturer |
|---|---|
| 566-6985426-25L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| H621-0102-25L1 | Naval Inventory Control Point Mechanicsburg (USA) |
| Reference | Meaning |
|---|---|
| H621-0102-25 | 5/1 Secondary reference U.S. Government activity |
| 566-6985426-25 | 3/1 Design control — primary reference Naval Sea Systems Command |
NSN 4810-01-544-9170 is a Piston,valve, manufactured by Naval Inventory Control Point Mechanicsburg, classified under FSC 4810, Valves, Powered. Status: active.
NSN 4810-01-544-9170 has 2 manufacturer part numbers on file: 566-6985426-25L1 (Naval Inventory Control Point Mechanicsburg), H621-0102-25L1 (Naval Inventory Control Point Mechanicsburg).
Key specifications for 566-6985426-25L1: Criticality Code Justification: ZZZY; End Item Identification: DESURGER ASSY,AFT; Reference Number Differentiating Characteristics: MATERIAL CONTROLLED IAW NAVSEA 0948-LP-045-7010 MATERIAL CONTROL STANDARD FOR LEVEL I ITEMS. 2 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.
NSN 4810-01-544-9170 has DEMIL Code Q. Demilitarization may be required before disposal or transfer to non-military entities.
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.