The Dehydrator Unit,nonreactivating, cataloged under National Stock Number 4440-01-646-7978, is classified within Federal Supply Class 4440 (Driers, Dehydrators, and Anhydrators) of the Furnace, Steam, Drying, Nuclear Reactors group. The manufacturer of record is Pentras, Inc. Dba Twin Tower Engineering. 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. Current acquisition status: Active.
| Parameter | Value |
|---|---|
| NSN | 4440-01-646-7978 |
| Primary Part Number | AIR 500-33 |
| Item Name | Dehydrator Unit,nonreactivating |
| FSC / FSG | 4440 / 44 — Driers, Dehydrators, and Anhydrators |
| Manufacturer | Pentras, Inc. Dba Twin Tower Engineering |
| Status | ACTIVE |
| Body Overall Height | 26.0 INCHES NOMINAL IN |
| Body Overall Width | 19.0 INCHES NOMINAL IN |
| 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 |
|---|---|
| AIR 500-33 | Altec Air, Llc Dba Altec Llc (USA) |
| AIR 500-33 PRIMARY | Pentras, Inc. Dba Twin Tower Engineering (USA) |
NSN 4440-01-646-7978 is a Dehydrator Unit,nonreactivating, manufactured by Pentras, Inc. Dba Twin Tower Engineering, classified under FSC 4440, Driers, Dehydrators, and Anhydrators. Status: active.
NSN 4440-01-646-7978 has 2 manufacturer part numbers on file: AIR 500-33 (Altec Air, Llc Dba Altec Llc), AIR 500-33 (Pentras, Inc. Dba Twin Tower Engineering).
Key specifications for AIR 500-33: Special Features: COMPRESSER MOTOR 1/6 HP OILLESS PISTON TYPE; 115 V; SINGLE PHASE; 60 HZ V; Part Name Assigned by Controlling Agency: AIR DRYER; Body Overall Height: 26.0 INCHES NOMINAL IN; Body Overall Width: 19.0 INCHES NOMINAL IN. 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.
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.