The Dehydrator Unit,nonreactivating, cataloged under National Stock Number 4440-00-689-6437, is classified within Federal Supply Class 4440 (Driers, Dehydrators, and Anhydrators) of the Furnace, Steam, Drying, Nuclear Reactors group. Government technical data includes 1 specification, cited from the U.S. Government catalog. 7 additional reference documents (drawings, advisory and superseded references) are recorded in the U.S. Government catalog. 1 item shares a part number with this NSN in the catalog (possible match — not a government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.
| Parameter | Value |
|---|---|
| NSN | 4440-00-689-6437 |
| Item Name | Dehydrator Unit,nonreactivating |
| FSC / FSG | 4440 / 44 — Driers, Dehydrators, and Anhydrators |
| Status | ACTIVE |
| Supplementary Features | CLEANED IN ACCORDANCE WITH MIL-STD-1330D |
| 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 |
|---|---|
| 500572-1 | 5/9 Secondary reference U.S. Government activity |
| 500572-1CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 21-19827 FIND 4 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 22-38625 | C/1 Advisory reference — outside the item-of-supply concept U.S. Government activity |
| 22-38625CP | 5/1 Secondary reference Naval Inventory Control Point Mechanicsburg |
| 22-38625CP | 3/2 Design control — primary reference U.S. Government activity |
| 21-19827 FIND 4CP | C/1 Advisory reference — outside the item-of-supply concept Naval Inventory Control Point Mechanicsburg |
NSN 4440-00-689-6437 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): 5340-01-379-5961. Verify interchangeability with system specifications before substitution.
Key specifications for 4440-00-689-6437: Supplementary Features: CLEANED IN ACCORDANCE WITH MIL-STD-1330D. 1 specification is 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.
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.