The Dehydrator Unit,nonreactivating, cataloged under National Stock Number 4440-00-689-6439, is classified within Federal Supply Class 4440 (Driers, Dehydrators, and Anhydrators) of the Furnace, Steam, Drying, Nuclear Reactors group. 6 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government interchangeability claim). Current acquisition status: Active.
| Item Name | Dehydrator Unit,nonreactivating |
| FSC / FSG | 4440 — Driers, Dehydrators, and Anhydrators (FSG 44) |
| Parameter | Value |
|---|---|
| NSN | 4440-00-689-6439 |
| Item Name | Dehydrator Unit,nonreactivating |
| FSC / FSG | 4440 / 44 — Driers, Dehydrators, and Anhydrators |
| 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 |
| Reference | Meaning |
|---|---|
| 28-90376CP | 3/2 Design control — primary reference U.S. Government activity |
| 301037-1CP | 5/9 Secondary reference U.S. Government activity |
| 301037-1 | 5/9 Secondary reference U.S. Government activity |
| 28-90376CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 301037-1CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 28-90376 | 3/1 Design control — primary reference U.S. Government activity |
NSN 4440-00-689-6439 is a Dehydrator Unit,nonreactivating, classified under FSC 4440, Driers, Dehydrators, and Anhydrators. Status: active.
1 possible match (shared part number, not a government interchangeability claim): 6220-01-020-2550. Verify interchangeability with system specifications before substitution.
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.